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Nikolić N, Poluga J, Milošević I, Todorović N, Filipović A, Jegorović B, Mitrović N, Karić U, Gmizić I, Stevanović G, Milošević B. Neurological and neuromuscular manifestations in patients with West Nile neuroinvasive disease, Belgrade area, Serbia, season 2022. Neurol Sci 2024; 45:719-726. [PMID: 37606743 DOI: 10.1007/s10072-023-07025-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 08/16/2023] [Indexed: 08/23/2023]
Abstract
INTRODUCTION We aimed to describe neurological manifestations and functional outcome at discharge in patients with West Nile neuroinvasive disease. METHODS This retrospective study enrolled inpatients treated in the University Clinic for Infectious and Tropical Diseases in Belgrade, Serbia, from 1 June until 31 October 2022. Functional outcome at discharge was assessed using modified Rankin scale. RESULTS Among the 135 analyzed patients, encephalitis, meningitis and acute flaccid paralysis (AFP) were present in 114 (84.6%), 20 (14.8%), and 21 (15.6%), respectively. Quadriparesis/quadriplegia and monoparesis were the most frequent forms of AFP, present in 9 (6.7%) and 6 (4.4%) patients, respectively. Fourty-five (33.3%) patients had cerebellitis, 80 (59.3%) had rhombencephalitis, and 5 (3.7%) exhibited Parkinsonism. Ataxia and wide-based gait were present in 79 (58.5%) patients each. Fifty-one (37.8%) patients had tremor (41 (30.3%) had postural and/or kinetic tremor, 10 (7.4%) had resting tremor). Glasgow coma score (GCS) ≤ 8 and respiratory failure requiring mechanical ventilation developed in 39 (28.9%), and 33 (24.4%) patients, respectively. Quadriparesis was a risk factor for prolonged ventilator support (29.5 ± 16.8 vs. 12.4 ± 8.7 days, p = 0.001). At discharge, one patient with monoparesis recovered full muscle strength, whereas 8 patients with AFP were functionally dependent. Twenty-nine (21.5%) patients died. All of the succumbed had encephalitis, and 7 had quadriparesis. Ataxia, tremor and cognitive deficit persisted in 18 (16.9%), 15 (14.2%), and 22 (16.3%) patients at discharge, respectively. Age, malignancy, coronary disease, quadriparesis, mechanical ventilation, GCS ≤ 8 and healthcare-associated infections were risk factors for death (p = 0.001; p = 0.019; p = 0.004; p = 0.001; p < 0.001; p < 0.001, and p < 0.001, respectively).
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Affiliation(s)
- Nataša Nikolić
- University Clinic for Infectious and Tropical Diseases of the University Clinical Centre of Serbia, Belgrade, Serbia
- Faculty of Medicine, University of Belgrade, Belgrade, Serbia
| | - Jasmina Poluga
- University Clinic for Infectious and Tropical Diseases of the University Clinical Centre of Serbia, Belgrade, Serbia
- Faculty of Medicine, University of Belgrade, Belgrade, Serbia
| | - Ivana Milošević
- University Clinic for Infectious and Tropical Diseases of the University Clinical Centre of Serbia, Belgrade, Serbia
- Faculty of Medicine, University of Belgrade, Belgrade, Serbia
| | - Nevena Todorović
- University Clinic for Infectious and Tropical Diseases of the University Clinical Centre of Serbia, Belgrade, Serbia
| | - Ana Filipović
- University Clinic for Infectious and Tropical Diseases of the University Clinical Centre of Serbia, Belgrade, Serbia
| | - Boris Jegorović
- University Clinic for Infectious and Tropical Diseases of the University Clinical Centre of Serbia, Belgrade, Serbia
- Faculty of Medicine, University of Belgrade, Belgrade, Serbia
| | - Nikola Mitrović
- University Clinic for Infectious and Tropical Diseases of the University Clinical Centre of Serbia, Belgrade, Serbia
- Faculty of Medicine, University of Belgrade, Belgrade, Serbia
| | - Uroš Karić
- University Clinic for Infectious and Tropical Diseases of the University Clinical Centre of Serbia, Belgrade, Serbia
- Faculty of Medicine, University of Belgrade, Belgrade, Serbia
| | - Ivana Gmizić
- University Clinic for Infectious and Tropical Diseases of the University Clinical Centre of Serbia, Belgrade, Serbia
| | - Goran Stevanović
- University Clinic for Infectious and Tropical Diseases of the University Clinical Centre of Serbia, Belgrade, Serbia
- Faculty of Medicine, University of Belgrade, Belgrade, Serbia
| | - Branko Milošević
- University Clinic for Infectious and Tropical Diseases of the University Clinical Centre of Serbia, Belgrade, Serbia.
- Faculty of Medicine, University of Belgrade, Belgrade, Serbia.
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Eid AM, Nakawah MO. West Nile virus encephalomyelitis in an immunocompromised patient. Radiol Case Rep 2023; 18:4499-4506. [PMID: 37876892 PMCID: PMC10590767 DOI: 10.1016/j.radcr.2023.09.050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 08/30/2023] [Accepted: 09/16/2023] [Indexed: 10/26/2023] Open
Abstract
We report a case of a 50-year-old immunocompromised woman who presented with acute encephalopathy and gait ataxia due to severe West Nile virus encephalomyelitis. The patient remarkably improved following early and sustained aggressive immunomodulation. Diagnosing West Nile neuroinvasive disease could be challenging without biochemical evidence of West Nile virus nucleic acid in the cerebrospinal fluid, a specific but not sensitive test. Although the neuroimaging findings in our patient could be considered "typical" for West Nile neuroinvasive disease, there is an overlap with the imaging abnormalities seen in other neuroinflammatory disorders presenting with acute leukoencephalopathy. Hence, we review West Nile neuroinvasive disease imaging characteristics and the differential diagnosis of acute leukoencephalopathy.
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Affiliation(s)
- Abdulmunaim M. Eid
- Stanley H. Appel Department of Neurology, Houston Methodist Neurological Institute, 6560 Fannin St. Scurlock Tower, Suite 750, Houston, TX 77030, USA
| | - Mohammad Obadah Nakawah
- Stanley H. Appel Department of Neurology, Houston Methodist Neurological Institute, 6560 Fannin St. Scurlock Tower, Suite 750, Houston, TX 77030, USA
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Telford SR, Piantadosi AL. Powassan virus persistence after acute infection. mBio 2023; 14:e0071223. [PMID: 37338444 PMCID: PMC10470498 DOI: 10.1128/mbio.00712-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Accepted: 05/04/2023] [Indexed: 06/21/2023] Open
Abstract
Survivors of Powassan encephalitis often have persistent neurological disease. A new mouse model replicates some elements of the human disease and demonstrates the presence of viral RNA in the brain as well as myelitis more than 2 mo after the acute infection. The related tick-borne encephalitis and West Nile Neuroinvasive Disease (WNND) also have common neurological sequelae, and models for these better-studied diseases provide evidence for prolonged virus, RNA, and inflammation in some cases, in addition to damage from the acute encephalitic disease. A better understanding of the biological basis for persistent signs and symptoms after Powassan encephalitis, currently a rare disease, could benefit from further studies of the more prevalent flaviviral encephalitides.
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Affiliation(s)
- Sam R. Telford
- Department of Infectious Disease and Global Health; Tufts Lyme Disease Initiative, Tufts University, North Grafton, Massachusetts, USA
| | - Anne L. Piantadosi
- Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
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Schwarz ER, Long MT. Comparison of West Nile Virus Disease in Humans and Horses: Exploiting Similarities for Enhancing Syndromic Surveillance. Viruses 2023; 15:1230. [PMID: 37376530 DOI: 10.3390/v15061230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 05/22/2023] [Accepted: 05/23/2023] [Indexed: 06/29/2023] Open
Abstract
West Nile virus (WNV) neuroinvasive disease threatens the health and well-being of horses and humans worldwide. Disease in horses and humans is remarkably similar. The occurrence of WNV disease in these mammalian hosts has geographic overlap with shared macroscale and microscale drivers of risk. Importantly, intrahost virus dynamics, the evolution of the antibody response, and clinicopathology are similar. The goal of this review is to provide a comparison of WNV infection in humans and horses and to identify similarities that can be exploited to enhance surveillance methods for the early detection of WNV neuroinvasive disease.
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Affiliation(s)
- Erika R Schwarz
- Montana Veterinary Diagnostic Laboratory, MT Department of Livestock, Bozeman, MT 59718, USA
| | - Maureen T Long
- Department of Comparative, Diagnostic, & Population Medicine, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610, USA
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Fiacre L, Lowenski S, Bahuon C, Dumarest M, Lambrecht B, Dridi M, Albina E, Richardson J, Zientara S, Jiménez-Clavero MÁ, Pardigon N, Gonzalez G, Lecollinet S. Evaluation of NS4A, NS4B, NS5 and 3'UTR Genetic Determinants of WNV Lineage 1 Virulence in Birds and Mammals. Viruses 2023; 15:v15051094. [PMID: 37243180 DOI: 10.3390/v15051094] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 04/21/2023] [Accepted: 04/25/2023] [Indexed: 05/28/2023] Open
Abstract
West Nile virus (WNV) is amplified in an enzootic cycle involving birds as amplifying hosts. Because they do not develop high levels of viremia, humans and horses are considered to be dead-end hosts. Mosquitoes, especially from the Culex genus, are vectors responsible for transmission between hosts. Consequently, understanding WNV epidemiology and infection requires comparative and integrated analyses in bird, mammalian, and insect hosts. So far, markers of WNV virulence have mainly been determined in mammalian model organisms (essentially mice), while data in avian models are still missing. WNV Israel 1998 (IS98) is a highly virulent strain that is closely genetically related to the strain introduced into North America in 1999, NY99 (genomic sequence homology > 99%). The latter probably entered the continent at New York City, generating the most impactful WNV outbreak ever documented in wild birds, horses, and humans. In contrast, the WNV Italy 2008 strain (IT08) induced only limited mortality in birds and mammals in Europe during the summer of 2008. To test whether genetic polymorphism between IS98 and IT08 could account for differences in disease spread and burden, we generated chimeric viruses between IS98 and IT08, focusing on the 3' end of the genome (NS4A, NS4B, NS5, and 3'UTR regions) where most of the non-synonymous mutations were detected. In vitro and in vivo comparative analyses of parental and chimeric viruses demonstrated a role for NS4A/NS4B/5'NS5 in the decreased virulence of IT08 in SPF chickens, possibly due to the NS4B-E249D mutation. Additionally, significant differences between the highly virulent strain IS98 and the other three viruses were observed in mice, implying the existence of additional molecular determinants of virulence in mammals, such as the amino acid changes NS5-V258A, NS5-N280K, NS5-A372V, and NS5-R422K. As previously shown, our work also suggests that genetic determinants of WNV virulence can be host-dependent.
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Affiliation(s)
- Lise Fiacre
- Animal Health Laboratory, L'alimentation et L'environnement (INRAE), Institut National de Recherche pour L'agriculture, École Vétérinaire d'Alfort (ENVA), Agence Nationale de Sécurité Sanitaire de L'alimentation, de L'environnement et du Travail (ANSES), UMR Virology, 94700 Maisons-Alfort, France
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), UMR ASTRE, 97170 Petit-Bourg, France
- ASTRE, CIRAD, INRAe, University of Montpellier, 34000 Montpellier, France
| | - Steeve Lowenski
- Animal Health Laboratory, L'alimentation et L'environnement (INRAE), Institut National de Recherche pour L'agriculture, École Vétérinaire d'Alfort (ENVA), Agence Nationale de Sécurité Sanitaire de L'alimentation, de L'environnement et du Travail (ANSES), UMR Virology, 94700 Maisons-Alfort, France
| | - Céline Bahuon
- Animal Health Laboratory, L'alimentation et L'environnement (INRAE), Institut National de Recherche pour L'agriculture, École Vétérinaire d'Alfort (ENVA), Agence Nationale de Sécurité Sanitaire de L'alimentation, de L'environnement et du Travail (ANSES), UMR Virology, 94700 Maisons-Alfort, France
| | - Marine Dumarest
- Animal Health Laboratory, L'alimentation et L'environnement (INRAE), Institut National de Recherche pour L'agriculture, École Vétérinaire d'Alfort (ENVA), Agence Nationale de Sécurité Sanitaire de L'alimentation, de L'environnement et du Travail (ANSES), UMR Virology, 94700 Maisons-Alfort, France
| | | | - Maha Dridi
- SCIENSANO, Avian Virology and Immunology, 1180 Brussels, Belgium
| | - Emmanuel Albina
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), UMR ASTRE, 97170 Petit-Bourg, France
- ASTRE, CIRAD, INRAe, University of Montpellier, 34000 Montpellier, France
| | - Jennifer Richardson
- Animal Health Laboratory, L'alimentation et L'environnement (INRAE), Institut National de Recherche pour L'agriculture, École Vétérinaire d'Alfort (ENVA), Agence Nationale de Sécurité Sanitaire de L'alimentation, de L'environnement et du Travail (ANSES), UMR Virology, 94700 Maisons-Alfort, France
| | - Stéphan Zientara
- Animal Health Laboratory, L'alimentation et L'environnement (INRAE), Institut National de Recherche pour L'agriculture, École Vétérinaire d'Alfort (ENVA), Agence Nationale de Sécurité Sanitaire de L'alimentation, de L'environnement et du Travail (ANSES), UMR Virology, 94700 Maisons-Alfort, France
| | - Miguel-Ángel Jiménez-Clavero
- Centro de Investigación en Sanidad Animal (CISA-INIA), CSIC, Carretera Algete-El Casar s/n, 28130 Valdeolmos, Spain
- CIBER Epidemiología y Salud Pública (CIBERESP), 28001 Madrid, Spain
| | | | - Gaëlle Gonzalez
- Animal Health Laboratory, L'alimentation et L'environnement (INRAE), Institut National de Recherche pour L'agriculture, École Vétérinaire d'Alfort (ENVA), Agence Nationale de Sécurité Sanitaire de L'alimentation, de L'environnement et du Travail (ANSES), UMR Virology, 94700 Maisons-Alfort, France
| | - Sylvie Lecollinet
- Animal Health Laboratory, L'alimentation et L'environnement (INRAE), Institut National de Recherche pour L'agriculture, École Vétérinaire d'Alfort (ENVA), Agence Nationale de Sécurité Sanitaire de L'alimentation, de L'environnement et du Travail (ANSES), UMR Virology, 94700 Maisons-Alfort, France
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Crum KJ, Batiste R. Bilateral Upper Extremity Tremors in West Nile Encephalitis. Cureus 2023; 15:e37168. [PMID: 37168156 PMCID: PMC10166338 DOI: 10.7759/cureus.37168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/05/2023] [Indexed: 04/08/2023] Open
Abstract
West Nile encephalitis is a rare complication of infection from the West Nile virus (WNv). Viral encephalitis can mimic manifestations of other neurologic diseases. The purpose of this article is to report a case of a 60-year-old female who developed bilateral upper extremity tremors with West Nile encephalitis. She presented to a hospital in Southern Louisiana with persistent high fevers and new onset confusion. She soon developed tremors which persisted throughout her hospitalization. Computerized tomography (CT) of the head revealed no abnormalities. Cerebral spinal fluid (CSF) was remarkable for WNv IgM, and supportive care was pursued. After nearly three weeks, she was transferred to a skilled nursing facility for further care. The presentation of movement disorder with confusion usually raises concern for injury to the brain or spinal cord or other neurologic illnesses. Despite the presentation of movement disorders or other neurologic manifestations, viral etiologies should remain high on the differential when the patient has additional symptoms, such as fever and elevated white blood cell (WBC) count, to limit inappropriate diagnostic testing and treatment.
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Giakountis A, Stylianidou Z, Zaka A, Pappa S, Papa A, Hadjichristodoulou C, Mathiopoulos KD. Development of Toehold Switches as a Novel Ribodiagnostic Method for West Nile Virus. Genes (Basel) 2023; 14:237. [PMID: 36672977 PMCID: PMC9859090 DOI: 10.3390/genes14010237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 01/12/2023] [Accepted: 01/13/2023] [Indexed: 01/18/2023] Open
Abstract
West Nile virus (WNV) is an emerging neurotropic RNA virus and a member of the genus Flavivirus. Naturally, the virus is maintained in an enzootic cycle involving mosquitoes as vectors and birds that are the principal amplifying virus hosts. In humans, the incubation period for WNV disease ranges from 3 to 14 days, with an estimated 80% of infected persons being asymptomatic, around 19% developing a mild febrile infection and less than 1% developing neuroinvasive disease. Laboratory diagnosis of WNV infection is generally accomplished by cross-reacting serological methods or highly sensitive yet expensive molecular approaches. Therefore, current diagnostic tools hinder widespread surveillance of WNV in birds and mosquitoes that serve as viral reservoirs for infecting secondary hosts, such as humans and equines. We have developed a synthetic biology-based method for sensitive and low-cost detection of WNV. This method relies on toehold riboswitches designed to detect WNV genomic RNA as transcriptional input and process it to GFP fluorescence as translational output. Our methodology offers a non-invasive tool with reduced operating cost and high diagnostic value that can be used for field surveillance of WNV in humans as well as in bird and mosquito populations.
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Affiliation(s)
- Antonis Giakountis
- Department of Biochemistry and Biotechnology, University of Thessaly, Biopolis-Mezourlo, 41500 Larissa, Greece
| | - Zoe Stylianidou
- Department of Biochemistry and Biotechnology, University of Thessaly, Biopolis-Mezourlo, 41500 Larissa, Greece
| | - Anxhela Zaka
- Department of Biochemistry and Biotechnology, University of Thessaly, Biopolis-Mezourlo, 41500 Larissa, Greece
| | - Styliani Pappa
- Department of Microbiology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Anna Papa
- Department of Microbiology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | | | - Kostas D. Mathiopoulos
- Department of Biochemistry and Biotechnology, University of Thessaly, Biopolis-Mezourlo, 41500 Larissa, Greece
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Ashkin A, Saccone N, Valle J, Rasnake M. Symmetric Ascending Paralysis Secondary to West Nile Virus. Case Rep Neurol 2023; 15:120-125. [PMID: 37497261 PMCID: PMC10368093 DOI: 10.1159/000529120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 01/02/2023] [Indexed: 07/28/2023] Open
Abstract
West Nile virus (WNV) is classified as a Flavivirus, belonging to a Japanese encephalitis subgroup often transmitted via mosquitoes. The classic presentation of a WNV infection usually displays high fevers, myalgias, and headache which can progress to neck stiffness, stupor, and coma (Case Rep Infect Dis. 2020;2020:6501658). Our case study presented with a rare manifestation of ascending paralysis, encompassing the feared neuroinvasive disease pattern that is seldom exhibited. This case had an unusual presentation as certain manifestations experienced by our patient closely resembled that of Guillain-Barré syndrome, although others were more indicative of poliomyelitis-like syndrome. Overall, the mainstay of therapy in both conditions is supportive care, although the prognosis varies substantially depending on the underlying diagnosis.
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Affiliation(s)
- Alex Ashkin
- NCH Graduate Medical Education, Naples, FL, USA
| | | | - Jose Valle
- Academic Pulmonologist with NCH Graduate Medical Education, Naples, FL, USA
| | - Mark Rasnake
- Academic Infectious Disease Specialist with NCH Graduate Medical Education, Naples, FL, USA
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Malone K, Abraham R, Mccurdy G, Devarkondal V, Stevens CM. An Atypical Presentation of West Nile Virus With Successful Treatment After Plasma Exchange and Intravenous Immunoglobulin. Cureus 2022; 14:e24003. [PMID: 35547450 PMCID: PMC9090226 DOI: 10.7759/cureus.24003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/09/2022] [Indexed: 11/16/2022] Open
Abstract
West Nile (WN) disease is a relatively rare arboviral virus. Neuroinvasive cases of WN account for less than 1% of the total cases. The case described had difficult symptomatology and radical presentation, which included ascending paralysis. To date, there have been very few reports of West Nile cases that present with ascending paralysis. We describe the case of a 63-year-old white male who presented with a fever and proximal muscle weakness in the thighs and legs that rapidly worsened and ascended, eventually resulting in diaphragmatic paralysis. He was intubated after respiratory failure and given intravenous immunoglobulin and plasma exchange. The patient remained ventilated with persistent weakness. However, this improved after intravenous immunoglobulin and plasma exchange therapy. This case serves as a reminder to keep the diagnosis of WN on the differential, a primer on advanced treatments in the setting of aggressive atypical WN, and a lesson on similarly presenting diseases and distinguishing characteristics that may help rule out these diseases from WN.
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Daniels DK, Conners GP. A Review of the Diagnosis and Management of Acute Flaccid Myelitis in the Emergency Department. Pediatr Emerg Care 2022; 38:126-130. [PMID: 35226621 DOI: 10.1097/pec.0000000000002660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
ABSTRACT Since 2014, biennial rises in acute flaccid myelitis (AFM) have brought attention to this rare but debilitating condition. Children with AFM typically present with acute onset, flaccid weakness accompanied by longitudinally extensive gray matter injury demonstrated on magnetic resonance imaging. A clearer understanding of the epidemiology and suspected pathogenesis of AFM may result in increased recognition. The purpose of this review article is to guide emergency physicians in recognizing key clinical features, initiating diagnostic evaluation and providing appropriate interventions for children with suspected AFM.
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Affiliation(s)
| | - Gregory P Conners
- Stanley A. August Professor and Chair of Pediatrics, Executive Director, Upstate Golisano Children's Hospital, SUNY Upstate Medical University, Syracuse, NY
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Severe West Nile Virus Neuroinvasive Disease: Clinical Characteristics, Short- and Long-Term Outcomes. Pathogens 2022; 11:pathogens11010052. [PMID: 35056000 PMCID: PMC8779330 DOI: 10.3390/pathogens11010052] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 12/17/2021] [Accepted: 12/30/2021] [Indexed: 11/26/2022] Open
Abstract
West Nile Virus Neuroinvasive Disease (WNV NID) requires prolonged intensive care treatment, resulting in high mortality and early disability. Long-term results are lacking. We have conducted an observational retrospective study with a prospective follow-up of WNV NID patients treated at the Intensive Care Unit (ICU), University Hospital for Infectious Diseases, Zagreb, Croatia, 2013–2018. Short-term outcomes were vital status, length of stay (LOS), modified Rankin Scale (mRS), and disposition at discharge. Long-term outcomes were vital status and mRS at follow-up. Twenty-three patients were identified, 78.3% males, median age 72 (range 33–84) years. Two patients (8.7%) died in the ICU, with no lethal outcomes after ICU discharge. The median ICU LOS was 19 days (range 5–73), and the median hospital LOS was 34 days (range 7–97). At discharge, 15 (65.2%) patients had moderate to severe/mRS 3–5, 6 (26.0%) had slight disability/mRS 2–1, no patients were symptom-free/mRS 0. Ten (47.6%) survivors were discharged to rehabilitation facilities. The median time to follow-up was nine months (range 6–69). At follow-up, seven patients died (30.5%), five (21.7%) had moderate to severe/mRS 3–5, one (4.3%) had slight disability/mRS 2–1, six (26.1%) had no symptoms/mRS 0, and four (17.4%) were lost to follow-up. Briefly, ten (43.5%) survivors improved their functional status, one (4.3%) was unaltered, and one (4.3%) aggravated. In patients with severe WNV NID, intensive treatment in the acute phase followed by inpatient rehabilitation resulted in significant recovery of functional status after several months.
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Chong PF, Torisu H, Yasumoto S, Okumura A, Mori H, Sato T, Kimura J, Ohga S, Tanaka-Taya K, Kira R. Clinical and electrophysiological features of acute flaccid myelitis: A national cohort study. Clin Neurophysiol 2021; 132:2456-2463. [PMID: 34454273 DOI: 10.1016/j.clinph.2021.07.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 07/06/2021] [Accepted: 07/13/2021] [Indexed: 10/20/2022]
Abstract
OBJECTIVE To summarize the neurophysiological properties of acute flaccid myelitis (AFM) and evaluate limb-based motor outcomes. METHODS Nerve conduction studies (NCS) in 49 patients (21 females, 28 males; median age = 52 m) with AFM (median = 7 d after onset; range 1-122 d) were reviewed. Neurophysiological findings, together with treatment and prognosis, and neurophysiology-neuroimaging correlations were analyzed. RESULTS The findings indicated that 64% of paralytic limbs during the acute stage (≤14 d after onset) showed diminished or absent compound muscle action potentials (CMAPs), 79% showed normal motor nerve conduction velocities, 55% showed decreased persistence or absent F-waves, and 95% showed normal sensory nerve conduction velocities. The rate of CMAP abnormalities increased from 41% on days 1-2 to 83% on days 13-14. The reduction in CMAP amplitude was correlated with weaker muscle strength at both the peak neurological deficit and the last follow-up. The baseline limb-based muscle strength at nadir and anterior horn-localized magnetic resonance imaging lesions at recovery stage (>14 d) were strong predictors of outcome at the last follow-up. CONCLUSIONS AFM typically shows neurophysiological features of neuronopathy. SIGNIFICANCE NCS is probably useful in the diagnosis and evaluation of AFM.
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Affiliation(s)
- Pin Fee Chong
- Department of Pediatric Neurology, Fukuoka Children's Hospital, Fukuoka, Japan; Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Hiroyuki Torisu
- Section of Pediatrics, Department of Medicine, Fukuoka Dental College, Fukuoka, Japan
| | - Sawa Yasumoto
- Medical Education Center, Fukuoka University School of Medicine, Fukuoka, Japan
| | - Akihisa Okumura
- Department of Pediatrics, Aichi Medical University, Nagakute, Aichi, Japan
| | - Harushi Mori
- Department of Radiology, Jichi Medical University, Tochigi, Japan
| | - Tatsuharu Sato
- Department of Pediatrics, Nagasaki University Hospital, Nagasaki, Japan
| | - Jun Kimura
- Division of Clinical Electrophysiology, Department of Neurology, University of Iowa Health Care, Iowa City, IA, USA
| | - Shouichi Ohga
- Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Keiko Tanaka-Taya
- Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Ryutaro Kira
- Department of Pediatric Neurology, Fukuoka Children's Hospital, Fukuoka, Japan.
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Martin MF, Nisole S. West Nile Virus Restriction in Mosquito and Human Cells: A Virus under Confinement. Vaccines (Basel) 2020; 8:E256. [PMID: 32485916 PMCID: PMC7350012 DOI: 10.3390/vaccines8020256] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 05/25/2020] [Accepted: 05/27/2020] [Indexed: 02/08/2023] Open
Abstract
West Nile virus (WNV) is an emerging neurotropic flavivirus that naturally circulates between mosquitoes and birds. However, WNV has a broad host range and can be transmitted from mosquitoes to several mammalian species, including humans, through infected saliva during a blood meal. Although WNV infections are mostly asymptomatic, 20% to 30% of cases are symptomatic and can occasionally lead to severe symptoms, including fatal meningitis or encephalitis. Over the past decades, WNV-carrying mosquitoes have become increasingly widespread across new regions, including North America and Europe, which constitutes a public health concern. Nevertheless, mosquito and human innate immune defenses can detect WNV infection and induce the expression of antiviral effectors, so-called viral restriction factors, to control viral propagation. Conversely, WNV has developed countermeasures to escape these host defenses, thus establishing a constant arms race between the virus and its hosts. Our review intends to cover most of the current knowledge on viral restriction factors as well as WNV evasion strategies in mosquito and human cells in order to bring an updated overview on WNV-host interactions.
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Affiliation(s)
| | - Sébastien Nisole
- Viral Trafficking, Restriction and Innate Signaling Team, Institut de Recherche en Infectiologie de Montpellier (IRIM), CNRS, 34090 Montpellier, France;
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Retrospective Descriptive Analysis of West Nile Neuroinvasive Disease (WNND) in Northwest Louisiana. Int J Microbiol 2020; 2020:3513859. [PMID: 32454831 PMCID: PMC7231183 DOI: 10.1155/2020/3513859] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Revised: 03/08/2020] [Accepted: 03/13/2020] [Indexed: 11/30/2022] Open
Abstract
Aims The aim of the study was to describe the presentation characteristics and epidemiology of WNND in Louisiana to improve future recognition of cases and decrease inappropriate antibiotic use. Settings and Design. It was a retrospective descriptive-analytic cohort study. A total of 23 patients with WNND were identified at one tertiary care hospital center in Northwest Louisiana from a retrospective chart review from January 1, 2012 to October 31, 2017. Results The median age was 49 years (range: 15–75) for patients with WNND. Of 23 patients diagnosed with WNND, twelve (52%) were diagnosed with encephalitis (WNE), six (26%) were diagnosed with meningitis (WNM), and five (22%) with myelitis (WNME). The common symptoms with WNND were fever in 65%, altered mental status in 61%, headache in 52%, fatigue in 43%, gastrointestinal symptoms in 43%, rigors in 30%, imbalance in 26%, rash in 9%, and seizures in 26% of patients. Most patients presented in the late summer season. The average duration of antibiotics given was six days. The average number of days from the admission to the diagnosis of WNND was nine days (3 to 16 days). Twenty-one (91%) patients survived the infection. Conclusions Identifying WNV infection early in its clinical course would help in decreasing inappropriate antibiotic use when patients presented with fever and meningeal symptoms. Performing WNV serology in CSF studies is critical in making the diagnosis.
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Bai F, Thompson EA, Vig PJS, Leis AA. Current Understanding of West Nile Virus Clinical Manifestations, Immune Responses, Neuroinvasion, and Immunotherapeutic Implications. Pathogens 2019; 8:pathogens8040193. [PMID: 31623175 PMCID: PMC6963678 DOI: 10.3390/pathogens8040193] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 10/12/2019] [Accepted: 10/13/2019] [Indexed: 12/11/2022] Open
Abstract
West Nile virus (WNV) is the most common mosquito-borne virus in North America. WNV-associated neuroinvasive disease affects all ages, although elderly and immunocompromised individuals are particularly at risk. WNV neuroinvasive disease has killed over 2300 Americans since WNV entered into the United States in the New York City outbreak of 1999. Despite 20 years of intensive laboratory and clinical research, there are still no approved vaccines or antivirals available for human use. However, rapid progress has been made in both understanding the pathogenesis of WNV and treatment in clinical practices. This review summarizes our current understanding of WNV infection in terms of human clinical manifestations, host immune responses, neuroinvasion, and therapeutic interventions.
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Affiliation(s)
- Fengwei Bai
- Department of Cell and Molecular Biology, University of Southern Mississippi, Hattiesburg, MS 39406, USA.
| | - E Ashley Thompson
- Department of Cell and Molecular Biology, University of Southern Mississippi, Hattiesburg, MS 39406, USA.
| | - Parminder J S Vig
- Departments of Neurology, University of Mississippi Medical Center, Jackson, MS 39216, USA.
| | - A Arturo Leis
- Methodist Rehabilitation Center, Jackson, MS 39216, USA.
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Abstract
Japanese encephalitis is a mosquito-borne disease that occurs in Asia and is caused by Japanese encephalitis virus (JEV), a member of the genus Flavivirus. Although many flaviviruses can cause encephalitis, JEV causes particularly severe neurological manifestations. The virus causes loss of more disability-adjusted life years than any other arthropod-borne virus owing to the frequent neurological sequelae of the condition. Despite substantial advances in our understanding of Japanese encephalitis from in vitro studies and animal models, studies of pathogenesis and treatment in humans are lagging behind. Few mechanistic studies have been conducted in humans, and only four clinical trials of therapies for Japanese encephalitis have taken place in the past 10 years despite an estimated incidence of 69,000 cases per year. Previous trials for Japanese encephalitis might have been too small to detect important benefits of potential treatments. Many potential treatment targets exist for Japanese encephalitis, and pathogenesis and virological studies have uncovered mechanisms by which these drugs could work. In this Review, we summarize the epidemiology, clinical features, prevention and treatment of Japanese encephalitis and focus on potential new therapeutic strategies, based on repurposing existing compounds that are already suitable for human use and could be trialled without delay. We use our newly improved understanding of Japanese encephalitis pathogenesis to posit potential treatments and outline some of the many challenges that remain in tackling the disease in humans.
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Philpott DCE, Nolan MS, Evert N, Mayes B, Hesalroad D, Fonken E, Murray KO. Acute and Delayed Deaths after West Nile Virus Infection, Texas, USA, 2002-2012. Emerg Infect Dis 2019; 25. [PMID: 30667356 PMCID: PMC6346437 DOI: 10.3201/eid2502.181250] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Infected patients should be closely monitored for prevention of future health problems. Infection with West Nile virus (WNV) has a well-characterized acute disease process. However, long-term consequences are less understood. We searched death records for 4,142 residents of Texas, USA, infected with WNV during 2002–2012 and identified 557 (13%) deaths. We analyzed all-cause and cause-specific deaths after WNV infection by calculating standardized mortality ratios and using statewide mortality data. Acute-phase deaths (<90 days after symptom onset) occurred in 289 (7%) of case-patients; of those deaths, 289 (92%) were cases of West Nile neuroinvasive disease (WNND). Convalescent-phase deaths (>90 days after symptom onset) occurred in 268 (7%) of the remaining 3,853 case-patients; 210 (78%) of these deaths occurred in patients with WNND. Convalescent-phase WNND case-patients showed excess deaths from infectious and renal causes; case-patients <60 years of age had increased risk for all-cause death, specifically from renal, infectious, digestive, and circulatory causes. We provide population-level evidence of increased risk for death after WNV infection resulting in WNND.
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18
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Patients with laboratory evidence of West Nile virus disease without reported fever. Epidemiol Infect 2019; 147:e219. [PMID: 31364561 PMCID: PMC6624872 DOI: 10.1017/s0950268819001079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
In 2013, the national surveillance case definition for West Nile virus (WNV) disease was revised to remove fever as a criterion for neuroinvasive disease and require at most subjective fever for non-neuroinvasive disease. The aims of this project were to determine how often afebrile WNV disease occurs and assess differences among patients with and without fever. We included cases with laboratory evidence of WNV disease reported from four states in 2014. We compared demographics, clinical symptoms and laboratory evidence for patients with and without fever and stratified the analysis by neuroinvasive and non-neuroinvasive presentations. Among 956 included patients, 39 (4%) had no fever; this proportion was similar among patients with and without neuroinvasive disease symptoms. For neuroinvasive and non-neuroinvasive patients, there were no differences in age, sex, or laboratory evidence between febrile and afebrile patients, but hospitalisations were more common among patients with fever (P < 0.01). The only significant difference in symptoms was for ataxia, which was more common in neuroinvasive patients without fever (P = 0.04). Only 5% of non-neuroinvasive patients did not meet the WNV case definition due to lack of fever. The evidence presented here supports the changes made to the national case definition in 2013.
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19
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Albertson AJ, Dietz AR, Younce JR, Varadhachary AS. Clinical Problem-Solving: Fever and Rapidly Progressive Weakness in an Immunocompromised Patient. Neurohospitalist 2018; 8:194-198. [PMID: 30245771 DOI: 10.1177/1941874418754966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Here we report the challenging case of a 41-year-old man with HIV complicated by AIDS and a history of prior neurologic injury from progressive multifocal leukoencephalopathy who presented with headache, fevers, lower extremity weakness, hyperreflexic upper extremities, and diminished lower extremity reflexes. We review the clinical decision-making and differential diagnosis for this presentation as the physical examination evolved and diagnostic testing changed over time.
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Affiliation(s)
- Asher J Albertson
- Department of Neurology, Washington University School of Medicine, St Louis, MO, USA
| | - Alexander R Dietz
- Department of Neurology, Washington University School of Medicine, St Louis, MO, USA
| | - John R Younce
- Department of Neurology, Washington University School of Medicine, St Louis, MO, USA
| | - Arun S Varadhachary
- Department of Neurology, Washington University School of Medicine, St Louis, MO, USA
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Sheppard DP, Woods SP, Hasbun R, Salazar L, Nolan MS, Murray KO. Does intra-individual neurocognitive variability relate to neuroinvasive disease and quality of life in West Nile Virus? J Neurovirol 2018; 24:506-513. [PMID: 29696579 DOI: 10.1007/s13365-018-0641-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Revised: 03/08/2018] [Accepted: 04/10/2018] [Indexed: 11/29/2022]
Abstract
West Nile Virus (WNV) can be a neuroinvasive pathogen that may produce persistent mild-to-moderate neurocognitive impairments in some infected persons. Intra-individual variability (IIV) is an index of a person's performance across a neuropsychological test or battery, which is an indicator of neurocognitive control and integrity of prefrontal systems. The present study examined possible associations of IIV to neurological health and well-being in WNV infection. Participants included 84 adults with a range of clinical WNV disease (31 West Nile Encephalitis, 16 West Nile Meningitis, 37 West Nile Fever) who completed the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS). IIV was operationalized as covariance of variation (CoV), or the intra-individual standard deviation across 5 age-adjusted RBANS standard scores divided by the mean of standard scores. Participants were assessed for health-related quality of life (QoL) using the RAND 36-item short form health survey (SF-36). Analyses revealed that the West Nile Encephalitis group had higher neurocognitive CoV compared to the West Nile Fever group, and this difference was associated with a medium effect size (Cohen's d = .52). Mixed linear models controlling for estimated IQ, activities of daily living, depression, neuroinvasive disease groups, and fatigue showed that higher RBANS CoV was associated with lower physical, but not mental health QoL. In persons with WNV infection, there is a modest association between elevations in IIV and encephalitis, and even subtle disruptions in neuropsychological functioning show relationships with important self-reported functioning as measured by physical health quality of life. Future studies should examine whether IIV predicts long-term health outcomes (e.g., mortality) in individuals infected with WNV.
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Affiliation(s)
- David P Sheppard
- Department of Psychology, University of Houston, Houston, TX, USA
| | | | - Rodrigo Hasbun
- Department of Internal Medicine, University of Texas Health Science Center in Houston, School of Medicine, Houston, TX, USA
| | - Lucrecia Salazar
- Department of Internal Medicine, University of Texas Health Science Center in Houston, School of Medicine, Houston, TX, USA
| | - Melissa S Nolan
- Baylor College of Medicine, Department of Pediatrics, Section of Pediatric Tropical Medicine, National School of Tropical Medicine, Houston, TX, USA
| | - Kristy O Murray
- Baylor College of Medicine, Department of Pediatrics, Section of Pediatric Tropical Medicine, National School of Tropical Medicine, Houston, TX, USA
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Budhram A, Sharma M, Shettar B, Hosseini-Moghaddam SM, Khaw AV. Sensory and autonomic involvement in West Nile virus-associated acute flaccid paralysis. Neurol Clin Pract 2018; 7:394-397. [PMID: 29620087 DOI: 10.1212/cpj.0000000000000373] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2017] [Accepted: 04/18/2017] [Indexed: 11/15/2022]
Affiliation(s)
- Adrian Budhram
- Departments of Clinical Neurological Sciences (AB, BS, AVK), Medical Imaging (MS), and Medicine (SMH-M), London Health Sciences Centre, Canada
| | - Manas Sharma
- Departments of Clinical Neurological Sciences (AB, BS, AVK), Medical Imaging (MS), and Medicine (SMH-M), London Health Sciences Centre, Canada
| | - Basavaraj Shettar
- Departments of Clinical Neurological Sciences (AB, BS, AVK), Medical Imaging (MS), and Medicine (SMH-M), London Health Sciences Centre, Canada
| | - Seyed M Hosseini-Moghaddam
- Departments of Clinical Neurological Sciences (AB, BS, AVK), Medical Imaging (MS), and Medicine (SMH-M), London Health Sciences Centre, Canada
| | - Alexander V Khaw
- Departments of Clinical Neurological Sciences (AB, BS, AVK), Medical Imaging (MS), and Medicine (SMH-M), London Health Sciences Centre, Canada
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22
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Abstract
Flaviviruses are a globally important group of human viral pathogens. These viruses enter cells by hijacking an endocytic pathway, clathrin-mediated endocytosis, used by cells to take up growth factors and nutrients. While most cargo is small, virions are large, and we identified host factors specifically required for the internalization of large cargo including these viruses. These studies define a set of requirements for viral internalization and which may be amenable to therapeutic interventions. Flaviviruses enter host cells through the process of clathrin-mediated endocytosis, and the spectrum of host factors required for this process are incompletely understood. Here we found that lymphocyte antigen 6 locus E (LY6E) promotes the internalization of multiple flaviviruses, including West Nile virus, Zika virus, and dengue virus. Perhaps surprisingly, LY6E is dispensable for the internalization of the endogenous cargo transferrin, which is also dependent on clathrin-mediated endocytosis for uptake. Since viruses are substantially larger than transferrin, we reasoned that LY6E may be required for uptake of larger cargoes and tested this using transferrin-coated beads of similar size as flaviviruses. LY6E was indeed required for the internalization of transferrin-coated beads, suggesting that LY6E is selectively required for large cargo. Cell biological studies found that LY6E forms tubules upon viral infection and bead internalization, and we found that tubule formation was dependent on RNASEK, which is also required for flavivirus internalization, but not transferrin uptake. Indeed, we found that RNASEK is also required for the internalization of transferrin-coated beads, suggesting it functions upstream of LY6E. These LY6E tubules resembled microtubules, and we found that microtubule assembly was required for their formation and flavivirus uptake. Since microtubule end-binding proteins link microtubules to downstream activities, we screened the three end-binding proteins and found that EB3 promotes virus uptake and LY6E tubularization. Taken together, these results highlight a specialized pathway required for the uptake of large clathrin-dependent endocytosis cargoes, including flaviviruses.
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Zika virus-induced acute myelitis and motor deficits in adult interferon αβ/γ receptor knockout mice. J Neurovirol 2018; 24:273-290. [PMID: 29476408 PMCID: PMC5992253 DOI: 10.1007/s13365-017-0595-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 10/11/2017] [Accepted: 10/23/2017] [Indexed: 12/22/2022]
Abstract
Zika virus (ZIKV) has received widespread attention because of its effect on the developing fetus. It is becoming apparent, however, that severe neurological sequelae, such as Guillian-Barrë syndrome (GBS), myelitis, encephalitis, and seizures can occur after infection of adults. This study demonstrates that a contemporary strain of ZIKV can widely infect astrocytes and neurons in the brain and spinal cord of adult, interferon α/β receptor knockout mice (AG129 strain) and cause progressive hindlimb paralysis, as well as severe seizure-like activity during the acute phase of disease. The severity of hindlimb motor deficits correlated with increased numbers of ZIKV-infected lumbosacral spinal motor neurons and decreased numbers of spinal motor neurons. Electrophysiological compound muscle action potential (CMAP) amplitudes in response to stimulation of the lumbosacral spinal cord were reduced when obvious motor deficits were present. ZIKV immunoreactivity was high, intense, and obvious in tissue sections of the brain and spinal cord. Infection in the brain and spinal cord was also associated with astrogliosis as well as T cell and neutrophil infiltration. CMAP and histological analysis indicated that peripheral nerve and muscle functions were intact. Consequently, motor deficits in these circumstances appear to be primarily due to myelitis and possibly encephalitis as opposed to a peripheral neuropathy or a GBS-like syndrome. Thus, acute ZIKV infection of adult AG129 mice may be a useful model for ZIKV-induced myelitis, encephalitis, and seizure activity.
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Majidi A, Saket S, Nabizadeh Gharghozar Z, Akrami E, Fayyazi SM. Hopkins Syndrome in a 14 Year Old Boy; a Case Report. EMERGENCY (TEHRAN, IRAN) 2018; 6:e23. [PMID: 30009225 PMCID: PMC6036531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Hopkins syndrome (HS) is a flaccid paralysis resembling poliomyelitis that has been seen in some children who are recovering from an acute episode of asthma. This syndrome should be suspected based on clinical findings even before the occurrence of characteristic breathing patterns and epilepsy. We report a 14-year-old boy who had experienced an episode of HS.
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Affiliation(s)
- Alireza Majidi
- Emergency Department, Shohadaye Tajrish Hospital, Shahaid Beheshti University of Medical Sciences, Tehran, Iran
| | - Sasan Saket
- Pediatric Neurology Research Center, Shahaid Beheshti University of Medical Sciences, Tehran, Iran
| | | | - Ehsan Akrami
- Pediatric Neurology Research Center, Shahaid Beheshti University of Medical Sciences, Tehran, Iran
| | - Seyed Mohsen Fayyazi
- Emergency Department, Shohadaye Tajrish Hospital, Shahaid Beheshti University of Medical Sciences, Tehran, Iran.,Corresponding Author: Seyed Mohsen Fayyazi; Emergency Department, Shohadaye Tajrish Hospital, Shahrdari Avenue, Tajrish Square, Tehran, Iran. Tel: 00989306224313,
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25
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Rosenberg J, Aradi S, Pruitt A. Clinical Reasoning: A man with rapidly ascending paralysis. Neurology 2017; 89:e25-e31. [DOI: 10.1212/wnl.0000000000004156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Abstract
Although long recognized as a human pathogen, West Nile virus (WNV) emerged as a significant public health problem following its introduction and spread across North America. Subsequent years have seen a greater understanding of all aspects of this viral infection. The North American epidemic resulted in a further understanding of the virology, pathogenesis, clinical features, and epidemiology of WNV infection. Approximately 80% of human WNV infections are asymptomatic. Most symptomatic people experience an acute systemic febrile illness; less than 1% of infected people develop neuroinvasive disease, which typically manifests as meningitis, encephalitis, or anterior myelitis resulting in acute flaccid paralysis. Older age is associated with more severe illness and higher mortality; other risk factors for poor outcome have been challenging to identify. In addition to natural infection through mosquito bites, transfusion- and organ transplant-associated infections have occurred. Since there is no definitive treatment for WNV infection, protection from mosquito bites and other preventative measures are critical. WNV has reached an endemic pattern in North America, but the future epidemiologic pattern is uncertain.
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Abstract
This chapter provides an overview of infectious syndromes, pathogens, and diagnostic testing modalities for central nervous system infections in the immunocompromised host.
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Martin JA, Messacar K, Yang ML, Maloney JA, Lindwall J, Carry T, Kenyon P, Sillau SH, Oleszek J, Tyler KL, Dominguez SR, Schreiner TL. Outcomes of Colorado children with acute flaccid myelitis at 1 year. Neurology 2017; 89:129-137. [PMID: 28615421 DOI: 10.1212/wnl.0000000000004081] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Accepted: 03/27/2017] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE We describe long-term functional, neurodiagnostic, and psychosocial outcomes of a cohort of 12 children from Colorado diagnosed with acute flaccid myelitis (AFM) in 2014. METHODS Children were assessed every 3 months for 1 year or until clinical resolution. Assessments included neurologic examination, MRI, EMG/nerve conduction studies (NCS), functional measures (Assisting Hand Assessment, Hammersmith Functional Motor Scale), and Patient-Reported Outcomes Measurement Information System questionnaires. RESULTS Eight of 12 children completed the study. Six of 8 had persistent motor deficits at 1 year; 2 demonstrated full recovery. Four were not enrolled, 2 of whom reported full recovery. The 6 affected were weakest in proximal muscles, showing minimal to no improvement and significant atrophy at 1 year. All patients improved in distal muscle groups. Cranial nerve dysfunction resolved in 2 of 5 and improved in all. Four of 5 showed progressive functional improvement at 6 and 12 months. Two of 8 reported pain at 1 year. Three of 8 reported depressive symptoms. Repeat MRI was performed in 7 of 8 children a median of 7 months after onset and showed significant improvement or normalization in all but one child. Repeat EMG/NCS was performed on 4 children a median of 8 months after onset and showed ongoing denervation and chronic reinnervation in 3 children with persistent deficits. CONCLUSIONS At 1 year, children with AFM demonstrated functional gains but weakness persisted. EMG changes correlated with persistent deficits better than imaging. Despite improvements, AFM had substantial long-term functional effects on affected children.
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Affiliation(s)
- Jan A Martin
- From the Departments of Pediatrics (J.A. Martin, M.L.Y., T.L.S.), Infectious Diseases (K.M., S.R.D.), Hospital Medicine (K.M.), Radiology (J.A. Maloney), Child Psychiatry (J.L.), and Physical Medicine and Rehabilitation (T.C., P.K., J.O.), Section of Child Neurology, Children's Hospital Colorado/University of Colorado School of Medicine, Aurora; and Departments of Neurology, Medicine, and Immunology-Microbiology and Neurology Service at the Denver Veterans Affairs Medical Center (S.H.S., K.L.T.), University of Colorado School of Medicine
| | - Kevin Messacar
- From the Departments of Pediatrics (J.A. Martin, M.L.Y., T.L.S.), Infectious Diseases (K.M., S.R.D.), Hospital Medicine (K.M.), Radiology (J.A. Maloney), Child Psychiatry (J.L.), and Physical Medicine and Rehabilitation (T.C., P.K., J.O.), Section of Child Neurology, Children's Hospital Colorado/University of Colorado School of Medicine, Aurora; and Departments of Neurology, Medicine, and Immunology-Microbiology and Neurology Service at the Denver Veterans Affairs Medical Center (S.H.S., K.L.T.), University of Colorado School of Medicine
| | - Michele L Yang
- From the Departments of Pediatrics (J.A. Martin, M.L.Y., T.L.S.), Infectious Diseases (K.M., S.R.D.), Hospital Medicine (K.M.), Radiology (J.A. Maloney), Child Psychiatry (J.L.), and Physical Medicine and Rehabilitation (T.C., P.K., J.O.), Section of Child Neurology, Children's Hospital Colorado/University of Colorado School of Medicine, Aurora; and Departments of Neurology, Medicine, and Immunology-Microbiology and Neurology Service at the Denver Veterans Affairs Medical Center (S.H.S., K.L.T.), University of Colorado School of Medicine
| | - John A Maloney
- From the Departments of Pediatrics (J.A. Martin, M.L.Y., T.L.S.), Infectious Diseases (K.M., S.R.D.), Hospital Medicine (K.M.), Radiology (J.A. Maloney), Child Psychiatry (J.L.), and Physical Medicine and Rehabilitation (T.C., P.K., J.O.), Section of Child Neurology, Children's Hospital Colorado/University of Colorado School of Medicine, Aurora; and Departments of Neurology, Medicine, and Immunology-Microbiology and Neurology Service at the Denver Veterans Affairs Medical Center (S.H.S., K.L.T.), University of Colorado School of Medicine
| | - Jennifer Lindwall
- From the Departments of Pediatrics (J.A. Martin, M.L.Y., T.L.S.), Infectious Diseases (K.M., S.R.D.), Hospital Medicine (K.M.), Radiology (J.A. Maloney), Child Psychiatry (J.L.), and Physical Medicine and Rehabilitation (T.C., P.K., J.O.), Section of Child Neurology, Children's Hospital Colorado/University of Colorado School of Medicine, Aurora; and Departments of Neurology, Medicine, and Immunology-Microbiology and Neurology Service at the Denver Veterans Affairs Medical Center (S.H.S., K.L.T.), University of Colorado School of Medicine
| | - Terri Carry
- From the Departments of Pediatrics (J.A. Martin, M.L.Y., T.L.S.), Infectious Diseases (K.M., S.R.D.), Hospital Medicine (K.M.), Radiology (J.A. Maloney), Child Psychiatry (J.L.), and Physical Medicine and Rehabilitation (T.C., P.K., J.O.), Section of Child Neurology, Children's Hospital Colorado/University of Colorado School of Medicine, Aurora; and Departments of Neurology, Medicine, and Immunology-Microbiology and Neurology Service at the Denver Veterans Affairs Medical Center (S.H.S., K.L.T.), University of Colorado School of Medicine
| | - Patricia Kenyon
- From the Departments of Pediatrics (J.A. Martin, M.L.Y., T.L.S.), Infectious Diseases (K.M., S.R.D.), Hospital Medicine (K.M.), Radiology (J.A. Maloney), Child Psychiatry (J.L.), and Physical Medicine and Rehabilitation (T.C., P.K., J.O.), Section of Child Neurology, Children's Hospital Colorado/University of Colorado School of Medicine, Aurora; and Departments of Neurology, Medicine, and Immunology-Microbiology and Neurology Service at the Denver Veterans Affairs Medical Center (S.H.S., K.L.T.), University of Colorado School of Medicine
| | - Stefan H Sillau
- From the Departments of Pediatrics (J.A. Martin, M.L.Y., T.L.S.), Infectious Diseases (K.M., S.R.D.), Hospital Medicine (K.M.), Radiology (J.A. Maloney), Child Psychiatry (J.L.), and Physical Medicine and Rehabilitation (T.C., P.K., J.O.), Section of Child Neurology, Children's Hospital Colorado/University of Colorado School of Medicine, Aurora; and Departments of Neurology, Medicine, and Immunology-Microbiology and Neurology Service at the Denver Veterans Affairs Medical Center (S.H.S., K.L.T.), University of Colorado School of Medicine
| | - Joyce Oleszek
- From the Departments of Pediatrics (J.A. Martin, M.L.Y., T.L.S.), Infectious Diseases (K.M., S.R.D.), Hospital Medicine (K.M.), Radiology (J.A. Maloney), Child Psychiatry (J.L.), and Physical Medicine and Rehabilitation (T.C., P.K., J.O.), Section of Child Neurology, Children's Hospital Colorado/University of Colorado School of Medicine, Aurora; and Departments of Neurology, Medicine, and Immunology-Microbiology and Neurology Service at the Denver Veterans Affairs Medical Center (S.H.S., K.L.T.), University of Colorado School of Medicine
| | - Kenneth L Tyler
- From the Departments of Pediatrics (J.A. Martin, M.L.Y., T.L.S.), Infectious Diseases (K.M., S.R.D.), Hospital Medicine (K.M.), Radiology (J.A. Maloney), Child Psychiatry (J.L.), and Physical Medicine and Rehabilitation (T.C., P.K., J.O.), Section of Child Neurology, Children's Hospital Colorado/University of Colorado School of Medicine, Aurora; and Departments of Neurology, Medicine, and Immunology-Microbiology and Neurology Service at the Denver Veterans Affairs Medical Center (S.H.S., K.L.T.), University of Colorado School of Medicine
| | - Samuel R Dominguez
- From the Departments of Pediatrics (J.A. Martin, M.L.Y., T.L.S.), Infectious Diseases (K.M., S.R.D.), Hospital Medicine (K.M.), Radiology (J.A. Maloney), Child Psychiatry (J.L.), and Physical Medicine and Rehabilitation (T.C., P.K., J.O.), Section of Child Neurology, Children's Hospital Colorado/University of Colorado School of Medicine, Aurora; and Departments of Neurology, Medicine, and Immunology-Microbiology and Neurology Service at the Denver Veterans Affairs Medical Center (S.H.S., K.L.T.), University of Colorado School of Medicine
| | - Teri L Schreiner
- From the Departments of Pediatrics (J.A. Martin, M.L.Y., T.L.S.), Infectious Diseases (K.M., S.R.D.), Hospital Medicine (K.M.), Radiology (J.A. Maloney), Child Psychiatry (J.L.), and Physical Medicine and Rehabilitation (T.C., P.K., J.O.), Section of Child Neurology, Children's Hospital Colorado/University of Colorado School of Medicine, Aurora; and Departments of Neurology, Medicine, and Immunology-Microbiology and Neurology Service at the Denver Veterans Affairs Medical Center (S.H.S., K.L.T.), University of Colorado School of Medicine.
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Uncini A, Shahrizaila N, Kuwabara S. Zika virus infection and Guillain-Barré syndrome: a review focused on clinical and electrophysiological subtypes. J Neurol Neurosurg Psychiatry 2017; 88:266-271. [PMID: 27799296 DOI: 10.1136/jnnp-2016-314310] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 10/14/2016] [Indexed: 01/12/2023]
Abstract
In 2016, we have seen a rapid emergence of Zika virus-associated Guillain-Barré syndrome (GBS) since its first description in a French-Polynesian patient in 2014. Current evidence estimates the incidence of GBS at 24 cases per 100 000 persons infected by Zika virus. This will result in a sharp rise in the number of GBS cases worldwide with the anticipated global spread of Zika virus. A better understanding of the pathogenesis of Zika-associated GBS is crucial to prepare us for the current epidemic. In this review, we evaluate the existing literature on GBS in association with Zika and other flavivirus to better define its clinical subtypes and electrophysiological characteristics, demonstrating a demyelinating subtype of GBS in most cases. We also recommend measures that will help reduce the gaps in knowledge that currently exist.
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Affiliation(s)
- Antonino Uncini
- Department of Neuroscience, Imaging and Clinical Sciences, University 'G. d'Annunzio' Chieti-Pescara, Chieti, Italy
| | | | - Satoshi Kuwabara
- Department of Neurology, Graduate School of Medicine, Chiba University, Chiba, Japan
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Li H, Saucedo-Cuevas L, Shresta S, Gleeson JG. The Neurobiology of Zika Virus. Neuron 2016; 92:949-958. [DOI: 10.1016/j.neuron.2016.11.031] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Revised: 10/21/2016] [Accepted: 11/17/2016] [Indexed: 01/17/2023]
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Abstract
PURPOSE OF REVIEW Arbovirus (arthropod-borne virus) infections are increasingly important causes of neurologic disease in the United States through both endemic transmission and travel-associated infections. This article reviews the major arbovirus infections that can cause neurologic disease likely to be encountered in the United States. RECENT FINDINGS West Nile virus continues to be an important cause of epidemic encephalitis, while emerging arbovirus infections such as dengue and chikungunya have rapidly expanded their geographic distribution. As emerging arboviruses expand in new geographic regions, neurologic abnormalities are reported in new patient populations. SUMMARY Emerging arbovirus infections are increasingly important causes of neurologic disease throughout the world and in the United States. While no US Food and Drug Administration (FDA)-approved therapy is yet available for these infections, prompt recognition and diagnosis from the consulting neurologist will ensure appropriate supportive care for the patient.
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Sejvar JJ, Lopez AS, Cortese MM, Leshem E, Pastula DM, Miller L, Glaser C, Kambhampati A, Shioda K, Aliabadi N, Fischer M, Gregoricus N, Lanciotti R, Nix WA, Sakthivel SK, Schmid DS, Seward JF, Tong S, Oberste MS, Pallansch M, Feikin D. Acute Flaccid Myelitis in the United States, August-December 2014: Results of Nationwide Surveillance. Clin Infect Dis 2016; 63:737-745. [PMID: 27318332 DOI: 10.1093/cid/ciw372] [Citation(s) in RCA: 153] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 05/20/2016] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND During late summer/fall 2014, pediatric cases of acute flaccid myelitis (AFM) occurred in the United States, coincident with a national outbreak of enterovirus D68 (EV-D68)-associated severe respiratory illness. METHODS Clinicians and health departments reported standardized clinical, epidemiologic, and radiologic information on AFM cases to the Centers for Disease Control and Prevention (CDC), and submitted biological samples for testing. Cases were ≤21 years old, with acute onset of limb weakness 1 August-31 December 2014 and spinal magnetic resonance imaging (MRI) showing lesions predominantly restricted to gray matter. RESULTS From August through December 2014, 120 AFM cases were reported from 34 states. Median age was 7.1 years (interquartile range, 4.8-12.1 years); 59% were male. Most experienced respiratory (81%) or febrile (64%) illness before limb weakness onset. MRI abnormalities were predominantly in the cervical spinal cord (103/118). All but 1 case was hospitalized; none died. Cerebrospinal fluid (CSF) pleocytosis (>5 white blood cells/µL) was common (81%). At CDC, 1 CSF specimen was positive for EV-D68 and Epstein-Barr virus by real-time polymerase chain reaction, although the specimen had >3000 red blood cells/µL. The most common virus detected in upper respiratory tract specimens was EV-D68 (from 20%, and 47% with specimen collected ≤7 days from respiratory illness/fever onset). Continued surveillance in 2015 identified 16 AFM cases reported from 13 states. CONCLUSIONS Epidemiologic data suggest this AFM cluster was likely associated with the large outbreak of EV-D68-associated respiratory illness, although direct laboratory evidence linking AFM with EV-D68 remains inconclusive. Continued surveillance will help define the incidence, epidemiology, and etiology of AFM.
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Affiliation(s)
- James J Sejvar
- Division of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases
| | - Adriana S Lopez
- Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Margaret M Cortese
- Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Eyal Leshem
- Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Daniel M Pastula
- Division of Vector-Borne Diseases, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Fort Collins
| | - Lisa Miller
- Epidemiology Division, Colorado Department of Public Health and Environment, Denver
| | - Carol Glaser
- Division of Communicable Disease Control, California Department of Public Health, Richmond
| | - Anita Kambhampati
- Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia.,Oak Ridge Institute of Science and Education, Tennessee
| | - Kayoko Shioda
- Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia.,Oak Ridge Institute of Science and Education, Tennessee
| | - Negar Aliabadi
- Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Marc Fischer
- Division of Vector-Borne Diseases, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Fort Collins
| | - Nicole Gregoricus
- Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Robert Lanciotti
- Division of Vector-Borne Diseases, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Fort Collins
| | - W Allan Nix
- Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Senthilkumar K Sakthivel
- Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - D Scott Schmid
- Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Jane F Seward
- Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Suxiang Tong
- Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - M Steven Oberste
- Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Mark Pallansch
- Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Daniel Feikin
- Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
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Kleinschmidt-DeMasters BK, Beckham JD. West Nile Virus Encephalitis 16 Years Later. Brain Pathol 2016; 25:625-33. [PMID: 26276026 DOI: 10.1111/bpa.12280] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Accepted: 06/12/2015] [Indexed: 12/27/2022] Open
Abstract
Arboviruses (Arthropod-borne viruses) include several families of viruses (Flaviviridae, Togaviradae, Bunyaviradae, Reoviradae) that are spread by arthropod vectors, most commonly mosquitoes, ticks and sandflies. The RNA genome allows these viruses to rapidly adapt to ever-changing host and environmental conditions. Thus, these virus families are largely responsible for the recent expansion in geographic range of emerging viruses including West Nile virus (WNV), dengue virus and Chikungunya virus. This review will focus on WNV, especially as it has progressively spread westward in North America since its introduction in New York in 1999. By 2003, WNV infections in humans had reached almost all lower 48 contiguous United States (US) and since that time, fluctuations in outbreaks have occurred. Cases decreased between 2008 and 2011, followed by a dramatic flair in 2012, with the epicenter in the Dallas-Fort Worth region of Texas. The 2012 outbreak was associated with an increase in reported neuroinvasive cases. Neuroinvasive disease continues to be a problem particularly in the elderly and immunocompromised populations, although WNV infections also represented the second most frequent cause of pediatric encephalitis in these same years. Neuropathological features in cases from the 2012 epidemic highlight the extent of viral damage that can occur in the CNS.
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Affiliation(s)
- Bette K Kleinschmidt-DeMasters
- Department of Pathology, University of Colorado Health Sciences Center, Aurora, CO.,Department of Neurology, University of Colorado Health Sciences Center, Aurora, CO.,Department of Neurosurgery, University of Colorado Health Sciences Center, Aurora, CO
| | - J David Beckham
- Department of Neurology, University of Colorado Health Sciences Center, Aurora, CO.,Department of Medicine, University of Colorado Health Sciences Center, Aurora, CO
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Suryapranata FST, Ang CW, Chong LL, Murk JL, Falconi J, Huits RMHG. Epidemiology of Guillain-Barré Syndrome in Aruba. Am J Trop Med Hyg 2016; 94:1380-4. [PMID: 27022152 DOI: 10.4269/ajtmh.15-0070] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2015] [Accepted: 01/05/2016] [Indexed: 11/07/2022] Open
Abstract
The epidemiology of Guillain-Barré syndrome (GBS) in tropical areas is different compared with developed countries. We investigated the epidemiology of GBS on the Caribbean island of Aruba. Data were collected retrospectively from all 36 patients hospitalized with GBS between 2003 and 2011 in Aruba. We observed a seasonal distribution of GBS cases with a peak in February. The incidence rate (IR) fluctuated heavily between individual years. The overall IR was 3.93/100,000, which is higher than that observed in developed countries. Serological studies indicated a possible relation of GBS cases with dengue virus infections. We also observed a relation between the annual number of dengue cases in Aruba and the number of GBS cases in the same year. We conclude that the epidemiology of GBS in tropical areas can be different from temperate climate regions and that dengue may be a trigger for developing GBS.
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Affiliation(s)
- Franciska S T Suryapranata
- Department of Medical Microbiology and Infection Control, VU University Medical Centre (VUMC), Amsterdam, The Netherlands; Department of Neurology, Dr Horacio E. Oduber Hospital, Oranjestad, Aruba; Department of Internal Medicine, Dr Horacio E. Oduber Hospital, Oranjestad, Aruba; Department of Microbiology, Landslaboratorium, Oranjestad, Aruba; Department of Virology, University Medical Centre Utrecht (UMCU), Utrecht, The Netherlands; Institute of Tropical Medicine, Antwerp, Belgium
| | - C Wim Ang
- Department of Medical Microbiology and Infection Control, VU University Medical Centre (VUMC), Amsterdam, The Netherlands; Department of Neurology, Dr Horacio E. Oduber Hospital, Oranjestad, Aruba; Department of Internal Medicine, Dr Horacio E. Oduber Hospital, Oranjestad, Aruba; Department of Microbiology, Landslaboratorium, Oranjestad, Aruba; Department of Virology, University Medical Centre Utrecht (UMCU), Utrecht, The Netherlands; Institute of Tropical Medicine, Antwerp, Belgium
| | - Luis L Chong
- Department of Medical Microbiology and Infection Control, VU University Medical Centre (VUMC), Amsterdam, The Netherlands; Department of Neurology, Dr Horacio E. Oduber Hospital, Oranjestad, Aruba; Department of Internal Medicine, Dr Horacio E. Oduber Hospital, Oranjestad, Aruba; Department of Microbiology, Landslaboratorium, Oranjestad, Aruba; Department of Virology, University Medical Centre Utrecht (UMCU), Utrecht, The Netherlands; Institute of Tropical Medicine, Antwerp, Belgium
| | - Jean-Luc Murk
- Department of Medical Microbiology and Infection Control, VU University Medical Centre (VUMC), Amsterdam, The Netherlands; Department of Neurology, Dr Horacio E. Oduber Hospital, Oranjestad, Aruba; Department of Internal Medicine, Dr Horacio E. Oduber Hospital, Oranjestad, Aruba; Department of Microbiology, Landslaboratorium, Oranjestad, Aruba; Department of Virology, University Medical Centre Utrecht (UMCU), Utrecht, The Netherlands; Institute of Tropical Medicine, Antwerp, Belgium
| | - Jaime Falconi
- Department of Medical Microbiology and Infection Control, VU University Medical Centre (VUMC), Amsterdam, The Netherlands; Department of Neurology, Dr Horacio E. Oduber Hospital, Oranjestad, Aruba; Department of Internal Medicine, Dr Horacio E. Oduber Hospital, Oranjestad, Aruba; Department of Microbiology, Landslaboratorium, Oranjestad, Aruba; Department of Virology, University Medical Centre Utrecht (UMCU), Utrecht, The Netherlands; Institute of Tropical Medicine, Antwerp, Belgium
| | - Ralph M H G Huits
- Department of Medical Microbiology and Infection Control, VU University Medical Centre (VUMC), Amsterdam, The Netherlands; Department of Neurology, Dr Horacio E. Oduber Hospital, Oranjestad, Aruba; Department of Internal Medicine, Dr Horacio E. Oduber Hospital, Oranjestad, Aruba; Department of Microbiology, Landslaboratorium, Oranjestad, Aruba; Department of Virology, University Medical Centre Utrecht (UMCU), Utrecht, The Netherlands; Institute of Tropical Medicine, Antwerp, Belgium
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Kuwar R, Stokic D, Leis A, Bai F, Paul A, Fratkin J, Vig P. Does astroglial protein S100B contribute to West Nile neuro-invasive syndrome? J Neurol Sci 2015; 358:243-52. [DOI: 10.1016/j.jns.2015.09.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Revised: 09/02/2015] [Accepted: 09/02/2015] [Indexed: 12/18/2022]
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Patel H, Sander B, Nelder MP. Long-term sequelae of West Nile virus-related illness: a systematic review. THE LANCET. INFECTIOUS DISEASES 2015; 15:951-9. [PMID: 26163373 DOI: 10.1016/s1473-3099(15)00134-6] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Revised: 05/25/2015] [Accepted: 06/08/2015] [Indexed: 12/18/2022]
Abstract
We systematically reviewed the clinical outlook of West Nile virus (WNV)-related illness in North America and western Europe. As of March, 2015, more than 45 000 cases of WNV-related illness have been reported in North America. Unlike acute morbidity and mortality, the long-term physical, cognitive, and functional sequelae associated with WNV-related illness are not well characterised. An understanding of WNV-related sequelae and their prognostic factors can support physicians with early diagnosis and tertiary prevention efforts. We searched Ovid Medline, Embase, Scopus, and Environment Complete for studies published between 1999 and 2015. We included 67 studies in our Review. Although muscle weakness, memory loss, and difficulties with activities of daily living were among the most common physical, cognitive, and functional sequelae, respectively, some population groups were reported to be at greater risk of severe neurological disease or death (ie, older men with underlying illnesses such as cardiovascular disease or cancer). A high level of heterogeneity was reported among studies included in this Review, suggesting a need for consistent methods for collecting data and reporting findings. Further, more than half of the studies reporting sequelae relied exclusively on subjective assessment and only two studies used matched control groups. Therefore, opportunities exist for more robust primary studies in future research.
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Affiliation(s)
- Hetal Patel
- Enteric, Zoonotic and Vector-Borne Diseases, Communicable Disease Prevention and Control, Public Health Ontario, Toronto, ON, Canada
| | - Beate Sander
- Public Health Sciences, Public Health Ontario, Toronto, ON, Canada; Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, ON, Canada; Institute for Clinical Evaluative Sciences, Toronto, ON, Canada
| | - Mark P Nelder
- Enteric, Zoonotic and Vector-Borne Diseases, Communicable Disease Prevention and Control, Public Health Ontario, Toronto, ON, Canada.
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Hart BL, Ketai L. Armies of pestilence: CNS infections as potential weapons of mass destruction. AJNR Am J Neuroradiol 2015; 36:1018-25. [PMID: 25477355 DOI: 10.3174/ajnr.a4177] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Infectious agents have been investigated, developed, and used by both governments and terrorist groups as weapons of mass destruction. CNS infections, though traditionally considered less often than respiratory diseases in this scenario, may be very important. Viruses responsible for encephalitides can be highly infectious in aerosol form. CNS involvement in anthrax is ominous but should change treatment. Brucellosis, plague, Q fever, and other bacteria can uncommonly manifest with meningoencephalitis and other findings. Emerging diseases may also pose threats. We review infectious agents of particular concern for purposes of biowarfare with respect to CNS manifestations and imaging features.
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Affiliation(s)
- B L Hart
- From the Department of Radiology, University of New Mexico, Albuquerque, New Mexico.
| | - L Ketai
- From the Department of Radiology, University of New Mexico, Albuquerque, New Mexico
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Abstract
A 43-year-old woman presented to George Washington emergency department with 48 h of new-onset inguinal pain. Physical examination revealed a diffuse maculopapular rash involving the palms and soles, as well as inguinal lymphadenopathy. The patient denied recent travel outside of Washington, DC, and had no known sick contacts. She was admitted to the hospital for observation. Within 24 h of admission she developed left lower extremity flaccid paralysis, with loss of left patellar and Achilles reflexes. cerebrospinal fluid was positive for West Nile virus IgG and IgM antibodies, so methylprednisone 125 mg intravenously two times per day was started. On day 7, the patient recovered reflexes and continued to regain strength in the left lower extremity. She was discharged on day 9 on prednisone taper, with outpatient follow-up.
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Affiliation(s)
- Ashely Alker
- Department of Medicine, George Washington University, Washington, DC, USA
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Siddharthan V, Wang H, Davies CJ, Hall JO, Morrey JD. Inhibition of West Nile virus by calbindin-D28k. PLoS One 2014; 9:e106535. [PMID: 25180779 PMCID: PMC4152291 DOI: 10.1371/journal.pone.0106535] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Accepted: 08/08/2014] [Indexed: 11/19/2022] Open
Abstract
Evidence indicates that West Nile virus (WNV) employs Ca2+ influx for its replication. Moreover, calcium buffer proteins, such as calbindin D28k (CB-D28k), may play an important role mitigating cellular destruction due to disease processes, and more specifically, in some neurological diseases. We addressed the hypothesis that CB-D28k inhibits WNV replication in cell culture and infected rodents. WNV envelope immunoreactivity (ir) was not readily co-localized with CB-D28k ir in WNV-infected Vero 76 or motor neuron-like NSC34 cells that were either stably or transiently transfected with plasmids coding for CB-D28k gene. This was confirmed in cultured cells fixed on glass coverslips and by flow cytometry. Moreover, WNV infectious titers were reduced in CB-D28k-transfected cells. As in cell culture studies, WNV env ir was not co-localized with CB-D28k ir in the cortex of an infected WNV hamster, or in the hippocampus of an infected mouse. Motor neurons in the spinal cord typically do not express CB-D28k and are susceptible to WNV infection. Yet, CB-D28k was detected in the surviving motor neurons after the initial phase of WNV infection in hamsters. These data suggested that induction of CB-D28k elicit a neuroprotective response to WNV infection.
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Affiliation(s)
- Venkatraman Siddharthan
- Institute for Antiviral Research, Department of Animal, Dairy, and Veterinary Sciences, Utah State University, Logan, Utah, United States of America
| | - Hong Wang
- Institute for Antiviral Research, Department of Animal, Dairy, and Veterinary Sciences, Utah State University, Logan, Utah, United States of America
| | - Christopher J. Davies
- Center for Integrated BioSystems, Department of Animal, Dairy, and Veterinary Sciences, Utah State University, Logan, Utah, United States of America
| | - Jeffery O. Hall
- Utah Veterinary Diagnostic Laboratory, Department of Animal, Dairy, and Veterinary Sciences, Utah State University, Logan, Utah, United States of America
| | - John D. Morrey
- Institute for Antiviral Research, Department of Animal, Dairy, and Veterinary Sciences, Utah State University, Logan, Utah, United States of America
- * E-mail:
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Hart J, Tillman G, Kraut MA, Chiang HS, Strain JF, Li Y, Agrawal AG, Jester P, Gnann JW, Whitley RJ. West Nile virus neuroinvasive disease: neurological manifestations and prospective longitudinal outcomes. BMC Infect Dis 2014; 14:248. [PMID: 24884681 PMCID: PMC4020876 DOI: 10.1186/1471-2334-14-248] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Accepted: 04/25/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND West Nile Virus (WNV) is a mosquito-borne flavivirus that has caused ongoing seasonal epidemics in the United States since 1999. It is estimated that ≤1% of WNV-infected patients will develop neuroinvasive disease (West Nile encephalitis and/or myelitis) that can result in debilitating morbidities and long-term sequelae. It is essential to collect longitudinal information about the recovery process and to characterize predicative factors that may assist in therapeutic decision-making in the future. METHODS We report a longitudinal study of the neurological outcomes (as measured by neurological examination, Glascow Coma Scale, and Modified Mini-Mental State Examination) for 55 subjects with WNV neuroinvasive disease (confirmed by positive CSF IgM) assessed on day 7, at discharge, and on days 14, 30, and 90. The neurological outcome measures were coma (presence and degree), global cognitive status, presence of cranial neuropathy, tremors and/or weakness. RESULTS At initial clinical presentation 93% presented with a significant neurological deficit (49% with weakness, 35% with tremor, and 16% with cranial neuropathy). The number of patients with a cognitive deficit fell from 25 at initial evaluation to 9 at their last evaluation. Cranial neuropathy was present in 9 at onset and in only 4 patients at study conclusion. Of the 19 patients who had a tremor at enrollment, 11 continued to exhibit a tremor at follow-up. Seven patients died after initial enrollment in the study, with 5 of those having presented in a coma. The factors that predict either severity or long-term recovery of neurological function include age (older individuals were weaker at follow-up examination), gender (males recovered better from coma), and presentation in a coma with cranial nerve deficits (had a poorer recovery particularly with regard to cognition). CONCLUSIONS This study represents one of the largest clinical investigations providing prospectively-acquired neurological outcomes data among American patients with WNV central nervous system disease. The findings show that the factors that influence prognosis from the initial presentation include age, gender, and specific neurological deficits at onset. TRIAL REGISTRATION ClinicalTrials.gov identifier: NCT00138463 and NCT00069316.
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Affiliation(s)
- John Hart
- Center for BrainHealth, University of Texas at Dallas, Dallas, TX, USA.
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Amanna IJ, Slifka MK. Current trends in West Nile virus vaccine development. Expert Rev Vaccines 2014; 13:589-608. [PMID: 24689659 DOI: 10.1586/14760584.2014.906309] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
West Nile virus (WNV) is a mosquito-borne flavivirus that has become endemic in the United States. From 1999-2012, there have been 37088 reported cases of WNV and 1549 deaths, resulting in a 4.2% case-fatality rate. Despite development of effective WNV vaccines for horses, there is no vaccine to prevent human WNV infection. Several vaccines have been tested in preclinical studies and to date there have been eight clinical trials, with promising results in terms of safety and induction of antiviral immunity. Although mass vaccination is unlikely to be cost effective, implementation of a targeted vaccine program may be feasible if a safe and effective vaccine can be brought to market. Further evaluation of new and advanced vaccine candidates is strongly encouraged.
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Affiliation(s)
- Ian J Amanna
- Najít Technologies, Inc., 505 NW 185th Avenue, Beaverton, OR 97006, USA
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Mojumder DK, Agosto M, Wilms H, Kim J. Is initial preservation of deep tendon reflexes in West Nile Virus paralysis a good prognostic sign? NEUROLOGY ASIA 2014; 19:93-97. [PMID: 25400704 PMCID: PMC4229851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Typical West Nile virus paralysis is characterized by muscle weakness, decreased tone, and loss of deep tendon reflexes attributed to destruction of anterior horn cells. Two cases in which deep tendon reflexes were initially preserved in the presence of profound and persistent muscle weakness are presented here. In both cases, deep tendon reflexes were later severely attenuated or lost, while weakness of the involved muscles remained profound and unchanged. Both patients showed good motor recovery at 6 months. Initial preservation of deep tendon reflexes in the presence of persistent muscle weakness indicates that in the early stages of disease, the muscle weakness in these two cases was not caused by destruction of anterior horn cells. Pathology involving anterior horns preceding AHC destruction could potentially disrupt upper motor neuron pathways to anterior horn cells, causing weakness with initial preserved deep tendon reflexes.
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Affiliation(s)
- Deb Kumar Mojumder
- Department of Neurology, Texas Tech University Health Sciences Center, School of Medicine, Lubbock, Texas. USA
| | - Melina Agosto
- Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, Texas, USA
| | - Henrik Wilms
- Department of Neurology, Texas Tech University Health Sciences Center, School of Medicine, Lubbock, Texas. USA
| | - Jongyeol Kim
- Department of Neurology, Texas Tech University Health Sciences Center, School of Medicine, Lubbock, Texas. USA
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Sejvar JJ. Clinical manifestations and outcomes of West Nile virus infection. Viruses 2014; 6:606-23. [PMID: 24509812 PMCID: PMC3939474 DOI: 10.3390/v6020606] [Citation(s) in RCA: 154] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 01/20/2014] [Accepted: 01/21/2014] [Indexed: 12/12/2022] Open
Abstract
Since the emergence of West Nile virus (WNV) in North America in 1999, understanding of the clinical features, spectrum of illness and eventual functional outcomes of human illness has increased tremendously. Most human infections with WNV remain clinically silent. Among those persons developing symptomatic illness, most develop a self-limited febrile illness. More severe illness with WNV (West Nile neuroinvasive disease, WNND) is manifested as meningitis, encephalitis or an acute anterior (polio) myelitis. These manifestations are generally more prevalent in older persons or those with immunosuppression. In the future, a more thorough understanding of the long-term physical, cognitive and functional outcomes of persons recovering from WNV illness will be important in understanding the overall illness burden.
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Affiliation(s)
- James J Sejvar
- National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA.
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Oyer RJ, David Beckham J, Tyler KL. West Nile and St. Louis encephalitis viruses. HANDBOOK OF CLINICAL NEUROLOGY 2014; 123:433-47. [PMID: 25015498 DOI: 10.1016/b978-0-444-53488-0.00020-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Ryan J Oyer
- Division of Infectious Diseases, Department of Medicine, University of Colorado School of Medicine, Aurora, CO, USA
| | - J David Beckham
- Division of Infectious Diseases, Department of Medicine, University of Colorado School of Medicine, Aurora, CO, USA; Department of Neurology, University of Colorado School of Medicine, Aurora, CO, USA; Department of Microbiology, University of Colorado School of Medicine, Aurora, CO, USA
| | - Kenneth L Tyler
- Division of Infectious Diseases, Department of Medicine, University of Colorado School of Medicine, Aurora, CO, USA; Department of Neurology, University of Colorado School of Medicine, Aurora, CO, USA; Department of Microbiology, University of Colorado School of Medicine, Aurora, CO, USA.
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Shaukat S, Angez M, Alam MM, Sharif S, Khurshid A, Mahmood T, Zaidi SSZ. Characterization of a novel enterovirus serotype and an enterovirus EV-B93 isolated from acute flaccid paralysis patients. PLoS One 2013; 8:e80040. [PMID: 24244603 PMCID: PMC3820551 DOI: 10.1371/journal.pone.0080040] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2013] [Accepted: 09/26/2013] [Indexed: 12/03/2022] Open
Abstract
Non-polio enteroviruses (NPEVs) are among the most common viruses infecting humans worldwide. Most of these infections are asymptomatic but few can lead to systemic and neurological disorders like Acute Flaccid Paralysis (AFP). Acute Flaccid Paralysis is a clinical syndrome and NPEVs have been isolated frequently from the patients suffering from AFP but little is known about their causal relationship. The objective of this study was to identify and characterize the NPEV serotypes recovered from 184 stool samples collected from AFP patients in Federally Administered Tribal Areas (FATA) in north-west of Pakistan. Overall, 44 (95.6 %) isolates were successfully typed through microneutralization assay as a member of enterovirus B species including echovirus (E)-2, E-3, E-4, E-6, E-7, E-11, E-13, E-14, E-21 and E-29 while two isolates (PAK NIH SP6545B and PAK NIH SP1202B) remained untypeable. The VP1 and capsid regions analysis characterized these viruses as EV-B93 and EV-B106. Phylogenetic analysis confirmed that PAK NIH isolates had high genetic diversity and represent distinct genotypes circulating in the country. Our findings highlight the role of NPEVs in AFP cases to be thoroughly investigated especially in high disease risk areas, with limited surveillance activities and health resources.
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Affiliation(s)
- Shahzad Shaukat
- Department of Virology, National Institute of Health, Chak Shahzad, Islamabad, Pakistan
- Department of Biotechnology, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Mehar Angez
- Department of Virology, National Institute of Health, Chak Shahzad, Islamabad, Pakistan
| | - Muhammad Masroor Alam
- Department of Virology, National Institute of Health, Chak Shahzad, Islamabad, Pakistan
| | - Salmaan Sharif
- Department of Virology, National Institute of Health, Chak Shahzad, Islamabad, Pakistan
| | - Adnan Khurshid
- Department of Virology, National Institute of Health, Chak Shahzad, Islamabad, Pakistan
| | - Tariq Mahmood
- Department of Plant Sciences, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Syed Sohail Zahoor Zaidi
- Department of Virology, National Institute of Health, Chak Shahzad, Islamabad, Pakistan
- * E-mail:
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Abstract
West Nile virus (WNV), the causative agent of West Nile fever and West Nile neuroinvasive disease in humans, has become endemic in many countries in all continents. Concerns on long-term mobility from WNV have arisen from recent studies that reported chronic kidney disease in patients who recovered from WNV infection, supported by data from animal models that showed prolonged excretion of the virus with urine. The purpose of this review is to summarize and discuss the results of studies in the literature that investigated WNV infection of the kidney in humans and in animal models and WNV excretion with urine, the potential damage to the kidney caused by WNV infection, the risk of WNV disease in kidney transplant recipients, the significance of detecting WNV in urine and its use in the diagnosis of WNV infection, and kidney involvement by other mosquito-borne flaviviruses.
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Affiliation(s)
- Luisa Barzon
- Department of Molecular Medicine, University of Padova, Via A. Gabelli 63, 35121 Padova, Italy.
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Saxena D, Kumar JS, Parida M, Sivakumar RR, Patro IK. Development and evaluation of NS1 specific monoclonal antibody based antigen capture ELISA and its implications in clinical diagnosis of West Nile virus infection. J Clin Virol 2013; 58:528-34. [DOI: 10.1016/j.jcv.2013.08.033] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Revised: 08/16/2013] [Accepted: 08/23/2013] [Indexed: 11/29/2022]
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Morrey JD, Siddharthan V, Wang H. Neurological approaches for investigating West Nile virus disease and its treatment in rodents. Antiviral Res 2013; 100:535-45. [PMID: 24055448 DOI: 10.1016/j.antiviral.2013.09.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Revised: 08/28/2013] [Accepted: 09/04/2013] [Indexed: 11/30/2022]
Abstract
West Nile virus (WNV) has had a major public health impact since its emergence in the Western Hemisphere; in 2012, nearly 3000 cases of WN neuroinvasive disease were identified in the United States. The underlying mechanisms of WN neurologic disease can only be studied to a limited extent in patients, but can be investigated in much greater detail in animal models. In this paper, we describe how we and others have employed a variety of electrophysiological and neurological techniques to study experimental WNV infections in hamsters and mice. The methods have included electrophysiological motor unit number estimation; optogenetic photoactivation of the spinal cord and electromyography; plethysmography; measurement of heart rate variability as an indication of autonomic nervous system dysfunction; and an assessment of spatial memory loss using the Morris water maze. These techniques provide a more refined assessment of disease manifestations in rodents than traditional measurements of weight loss and mortality, and should make it possible to identify targets for therapeutic intervention and to directly assess the effects of novel treatments.
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Affiliation(s)
- John D Morrey
- Institute for Antiviral Research, School of Veterinary Medicine, Department of Animal, Dairy, and Veterinary Sciences, Utah State University, Logan, UT, USA.
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A review of vaccine approaches for West Nile virus. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2013; 10:4200-23. [PMID: 24025396 PMCID: PMC3799512 DOI: 10.3390/ijerph10094200] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Revised: 09/02/2013] [Accepted: 09/05/2013] [Indexed: 01/19/2023]
Abstract
The West Nile virus (WNC) first appeared in North America in 1999. The North American lineages of WNV were characterized by the presence of neuroinvasive and neurovirulent strains causing disease and death in humans, birds and horses. The 2012 WNV season in the United States saw a massive spike in the number of neuroinvasive cases and deaths similar to what was seen in the 2002–2003 season, according to the West Nile virus disease cases and deaths reported to the CDC by year and clinical presentation, 1999–2012, by ArboNET (Arboviral Diseases Branch, Centers for Disease Control and Prevention). In addition, the establishment and recent spread of lineage II WNV virus strains into Western Europe and the presence of neurovirulent and neuroinvasive strains among them is a cause of major concern. This review discusses the advances in the development of vaccines and biologicals to combat human and veterinary West Nile disease.
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