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Jenkins WS, Pawade TA, Cartlidge T, Shah ASV, Williams M, White AC, Van Beek EJ, Newby DE, Dweck MR. P6052Computed tomography aortic valve calcium scoring is highly reproducible and predicts disease progression in aortic stenosis. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.p6052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- W S Jenkins
- University of Edinburgh, Centre for Cardiovascular Science, Edinburgh, United Kingdom
| | - T A Pawade
- University of Edinburgh, Centre for Cardiovascular Science, Edinburgh, United Kingdom
| | - T Cartlidge
- University of Edinburgh, Centre for Cardiovascular Science, Edinburgh, United Kingdom
| | - A S V Shah
- University of Edinburgh, Centre for Cardiovascular Science, Edinburgh, United Kingdom
| | - M Williams
- University of Edinburgh, Centre for Cardiovascular Science, Edinburgh, United Kingdom
| | - A C White
- University of Edinburgh, Centre for Cardiovascular Science, Edinburgh, United Kingdom
| | - E J Van Beek
- University of Edinburgh, Centre for Cardiovascular Science, Edinburgh, United Kingdom
| | - D E Newby
- University of Edinburgh, Centre for Cardiovascular Science, Edinburgh, United Kingdom
| | - M R Dweck
- University of Edinburgh, Centre for Cardiovascular Science, Edinburgh, United Kingdom
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Voils CI, Levine E, Gierisch JM, Pendergast J, Hale SL, McVay MA, Reed SD, Yancy WS, Bennett G, Strawbridge EM, White AC, Shaw RJ. Study protocol for Log2Lose: A feasibility randomized controlled trial to evaluate financial incentives for dietary self-monitoring and interim weight loss in adults with obesity. Contemp Clin Trials 2018; 65:116-122. [PMID: 29289702 PMCID: PMC5803330 DOI: 10.1016/j.cct.2017.12.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 12/08/2017] [Accepted: 12/20/2017] [Indexed: 10/18/2022]
Abstract
The obesity epidemic has negative physical, psychological, and financial consequences. Despite the existence of effective behavioral weight loss interventions, many individuals do not achieve adequate weight loss, and most regain lost weight in the year following intervention. We report the rationale and design for a 2×2 factorial study that involves financial incentives for dietary self-monitoring (yes vs. no) and/or interim weight loss (yes vs. no). Outpatients with obesity participate in a 24-week, group-based weight loss intervention. All participants are asked to record their daily dietary and liquid intake on a smartphone application (app) and to weigh themselves daily at home on a study-provided cellular scale. An innovative information technology (IT) solution collates dietary data from the app and weight from the scale. Using these data, an algorithm classifies participants weekly according to whether they met their group's criteria to receive a cash reward ranging from $0 to $30 for dietary self-monitoring and/or interim weight loss. Notice of the reward is provided via text message, and credit is uploaded to a gift card. This pilot study will provide information on the feasibility of using this novel IT solution to provide variable-ratio financial incentives in real time via its effects on recruitment, intervention adherence, retention, and cost. This study will provide the foundation for a comprehensive, adequately-powered, randomized controlled trial to promote short-term weight loss and long-term weight maintenance. If efficacious, this approach could reduce the prevalence, adverse outcomes, and costs of obesity for millions of Americans. Clinicaltrials.gov registration: NCT02691260.
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Affiliation(s)
- Corrine I Voils
- William S Middleton Memorial Veterans Hospital, USA; University of Wisconsin School of Medicine and Public Health, USA.
| | | | | | | | | | | | | | | | - Gary Bennett
- Duke University Medical School, USA; University of Florida, USA
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Del Brutto OH, Nash TE, White AC, Rajshekhar V, Wilkins PP, Singh G, Vasquez CM, Salgado P, Gilman RH, Garcia HH. Revised set of diagnostic criteria for neurocysticercosis (in reply to Garg and Malhotra). J Neurol Sci 2016; 373:350-351. [PMID: 28011076 DOI: 10.1016/j.jns.2016.12.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Accepted: 12/12/2016] [Indexed: 11/25/2022]
Affiliation(s)
- O H Del Brutto
- School of Medicine, Universidad Espíritu Santo - Ecuador, Guayaquil, Ecuador.
| | - T E Nash
- Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institute of Health, Bethesda, MD, United States
| | - A C White
- Infectious Disease Division, Department of Internal Medicine, University of Texas Medical Branch, Galveston, TX, United States
| | - V Rajshekhar
- Department of Neurological Sciences, Christian Medical College Hospital, Vellore, India
| | - P P Wilkins
- Parasitology Services, Marathon, Fl, United States
| | - G Singh
- Department of Neurology, Dayanand Medical College, Ludhiana, India
| | - C M Vasquez
- Department of Neurosurgery, Instituto Nacional de Ciencias Neurológicas, Lima, Peru
| | - P Salgado
- Neuroimaging Unit, National Institute of Neurology and Neurosurgery Manuel Velasco Suarez, Mexico City, Mexico
| | - R H Gilman
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - H H Garcia
- Center for Global Health, Tumbes and the Department of Microbiology, School of Sciences, Universidad Peruana Cayetano Heredia, Peru; Cysticercosis Unit, Instituto Nacional de Ciencias Neurológicas, Lima, Peru
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Del Brutto OH, Nash TE, White AC, Rajshekhar V, Wilkins PP, Singh G, Vasquez CM, Salgado P, Gilman RH, Garcia HH. Revised diagnostic criteria for neurocysticercosis. J Neurol Sci 2016; 372:202-210. [PMID: 28017213 DOI: 10.1016/j.jns.2016.11.045] [Citation(s) in RCA: 169] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Revised: 10/29/2016] [Accepted: 11/20/2016] [Indexed: 10/20/2022]
Abstract
BACKGROUND A unified set of criteria for neurocysticercosis (NCC) has helped to standardize its diagnosis in different settings. METHODS Cysticercosis experts were convened to update current diagnostic criteria for NCC according to two principles: neuroimaging studies are essential for diagnosis, and all other information provides indirect evidence favoring the diagnosis. Recent diagnostic advances were incorporated to this revised set. RESULTS This revised set is structured in absolute, neuroimaging and clinical/exposure criteria. Absolute criteria include: histological confirmation of parasites, evidence of subretinal cysts, and demonstration of the scolex within a cyst. Neuroimaging criteria are categorized as major (cystic lesions without scolex, enhancing lesions, multilobulated cysts, and calcifications), confirmative (resolution of cysts after cysticidal drug therapy, spontaneous resolution of single enhancing lesions, and migrating ventricular cysts on sequential neuroimaging studies) and minor (hydrocephalus and leptomeningeal enhancement). Clinical/exposure criteria include: detection of anticysticercal antibodies or cysticercal antigens by well-standardized tests, systemic cysticercosis, evidence of a household Taenia carrier, suggestive clinical manifestations, and residency in endemic areas. Besides patients having absolute criteria, definitive diagnosis can be made in those having two major neuroimaging criteria (or one major plus one confirmative criteria) plus exposure. For patients presenting with one major and one minor neuroimaging criteria plus exposure, definitive diagnosis of NCC requires the exclusion of confounding pathologies. Probable diagnosis is reserved for individuals presenting with one neuroimaging criteria plus strong evidence of exposure. CONCLUSIONS This revised set of diagnostic criteria provides simpler definitions and may facilitate its more uniform and widespread applicability in different scenarios.
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Affiliation(s)
- O H Del Brutto
- School of Medicine, Universidad Espíritu Santo - Ecuador, Guayaquil, Ecuador
| | - T E Nash
- Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institute of Health, Bethesda, MD, United States
| | - A C White
- Infectious Disease Division, Department of Internal Medicine, University of Texas Medical Branch, Galveston, TX, United States
| | - V Rajshekhar
- Department of Neurological Sciences, Christian Medical College Hospital, Vellore, India
| | - P P Wilkins
- Parasitology Services, Marathon, FL, United States
| | - G Singh
- Department of Neurology, Dayanand Medical College, Ludhiana, India
| | - C M Vasquez
- Department of Neurosurgery, Instituto Nacional de Ciencias Neurológicas, Lima, Peru
| | - P Salgado
- Neuroimaging Unit, National Institute of Neurology and Neurosurgery Manuel Velasco Suarez, Mexico City, Mexico
| | - R H Gilman
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - H H Garcia
- Center for Global Health, Tumbes, Peru; Department of Microbiology, School of Sciences, Universidad Peruana Cayetano Heredia, Peru; Cysticercosis Unit, Instituto Nacional de Ciencias Neurológicas, Lima, Peru.
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Smith NH, Musher DM, Huang DB, Rodriguez PS, Dowell ME, Ace W, White AC. Response of HIV-Infected Patients with Asymptomatic Syphilis to Intensive Intramuscular Therapy with Ceftriaxone or Procaine Penicillin. Int J STD AIDS 2016; 15:328-32. [PMID: 15117503 DOI: 10.1177/095646240401500511] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The objective of this prospective pilot study was to evaluate the response of HIV-infected patients with asymptomatic syphilis to one of two intensive antibiotic treatment regimens. Thirty-one HIV-infected patients with serum rapid plasma reagin titre ≥1:4 and no clinical findings of syphilis were randomized to receive daily intramuscular injections of ceftriaxone or procaine penicillin (plus oral probenecid) for 15 days; 24 returned for follow-up study. Seven of 10 (70%) procaine penicillin-treated patients and 10 of 14 (71%) ceftriaxone-treated patients had a ≥4-fold decline in RPR ( P=0.94); two penicillin-treated and one ceftriaxone-treated patient relapsed. Two patients failed ceftriaxone therapy. Three penicillin-treated, and two ceftriaxone-treated patients were serofast. Serological responses were similar in those patients with and without asymptomatic neurosyphilis. There was no difference in the serologic response to daily treatment with ceftriaxone vs that with procaine penicillin plus probenecid; both treatments were associated with comparatively high rates of serological non-response and relapse.
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Affiliation(s)
- N H Smith
- Infectious Disease Section, Department of Medicine, Baylor College of Medicine, One Baylor Plaza, 561E, Houston, Texas 77030, USA
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Villanueva-Meyer PG, Garcia-Jasso CA, Springer CA, Lane JK, Su BS, Hidalgo IS, Goodrich MR, Deichsel EL, White AC, Cabada MM. Advice on malaria and yellow fever prevention provided at travel agencies in Cuzco, Peru. J Travel Med 2015; 22:26-30. [PMID: 25156197 DOI: 10.1111/jtm.12149] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 05/30/2014] [Accepted: 07/01/2014] [Indexed: 11/29/2022]
Abstract
BACKGROUND Travelers receive medical advice from a variety of sources, including travel agencies. The aim of this study is to describe the quality of pre-travel advice provided by travel agencies in Cuzco to travelers interested in visiting malaria and yellow fever endemic areas. METHODS Trained medical students posed as tourists and visited travel agencies in Cuzco requesting travel advice for a trip to the southern Amazon of Peru, recording advice regarding risk and prevention of malaria and yellow fever. RESULTS A total of 163 registered travel agencies were included in the study. The mean proposed tour duration was 6.8 days (±1.4 days) with a median time to departure of 3 days and a median tour cost of 805 US dollars (USD) [interquartile range (IQR) 580-1,095]. Overall, 45% employees failed to mention the risk for any illness. Eighteen percent of the employees acknowledged risk of malaria and 53% risk of yellow fever. However, 36% denied malaria risk and 2% denied risk of yellow fever in the region. The price of tours from travel agencies that did not mention any health risk was significantly lower [1,009.6 ± 500.5 vs 783.9 ± 402 USD, t (152) = 3, p < 0.01] compared with the price from agencies that did mention health risks. Almost all who acknowledged malaria (97%) and/or yellow fever (100%) were able to provide at least one recommendation for prevention. However, advice was not always accurate or spontaneously volunteered. Only 7% of the employees provided both correct scheduling and location information for administration of the yellow fever vaccine. CONCLUSIONS The majority of registered travel agencies in Cuzco did not provide sufficient and accurate information regarding risk and prevention of malaria and yellow fever to travelers inquiring about trips to the southern Amazon of Peru.
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White AC, Khuu JK, Dang CY, Hu J, Tran KV, Liu A, Gomez S, Zhang Z, Yi R, Scumpia P, Grigorian M, Lowry WE. Stem cell quiescence acts as a tumour suppressor in squamous tumours. Nat Cell Biol 2013; 16:99-107. [PMID: 24335650 PMCID: PMC3874399 DOI: 10.1038/ncb2889] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Accepted: 10/31/2013] [Indexed: 12/23/2022]
Abstract
In some organs, adult stem cells are uniquely poised to serve as cancer cells of origin. It is unclear, however, whether tumorigenesis is influenced by the activation state of the adult stem cell. Hair follicle stem cells (HFSCs) act as cancer cells of origin for cutaneous squamous cell carcinoma (SCC) and undergo defined cycles of quiescence and activation. The data presented here show that HFSCs are unable to initiate tumors during the quiescent phase of the hair cycle, indicating that the mechanisms that keep HFSCs dormant are dominant to the gain of oncogenes (Ras) or the loss of tumor suppressors (p53). Furthermore, Pten activity is necessary for quiescence based tumor suppression, as its deletion alleviates tumor suppression without affecting proliferation. These data demonstrate that stem cell quiescence is a form of tumor suppression in HFSCs, and that Pten plays a role in maintaining quiescence in the presence of tumorigenic stimuli.
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Affiliation(s)
- A C White
- 1] Department of Molecular Cell and Developmental Biology, UCLA, California 90095, USA [2] Eli and Edythe Broad Center for Regenerative Medicine, UCLA, California 90095, USA
| | - J K Khuu
- 1] Department of Molecular Cell and Developmental Biology, UCLA, California 90095, USA [2] Eli and Edythe Broad Center for Regenerative Medicine, UCLA, California 90095, USA
| | - C Y Dang
- 1] Department of Molecular Cell and Developmental Biology, UCLA, California 90095, USA [2] Eli and Edythe Broad Center for Regenerative Medicine, UCLA, California 90095, USA
| | - J Hu
- 1] Department of Molecular Cell and Developmental Biology, UCLA, California 90095, USA [2] Eli and Edythe Broad Center for Regenerative Medicine, UCLA, California 90095, USA
| | - K V Tran
- 1] Department of Molecular Cell and Developmental Biology, UCLA, California 90095, USA [2] Eli and Edythe Broad Center for Regenerative Medicine, UCLA, California 90095, USA
| | - A Liu
- 1] Department of Molecular Cell and Developmental Biology, UCLA, California 90095, USA [2] Eli and Edythe Broad Center for Regenerative Medicine, UCLA, California 90095, USA
| | - S Gomez
- 1] Department of Molecular Cell and Developmental Biology, UCLA, California 90095, USA [2] Eli and Edythe Broad Center for Regenerative Medicine, UCLA, California 90095, USA
| | - Z Zhang
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, Colorado 80309, USA
| | - R Yi
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, Colorado 80309, USA
| | - P Scumpia
- Department of Medicine, Division of Dermatology, David Geffen School of Medicine, UCLA, California 90095, USA
| | - M Grigorian
- 1] Department of Molecular Cell and Developmental Biology, UCLA, California 90095, USA [2] Eli and Edythe Broad Center for Regenerative Medicine, UCLA, California 90095, USA
| | - W E Lowry
- 1] Department of Molecular Cell and Developmental Biology, UCLA, California 90095, USA [2] Eli and Edythe Broad Center for Regenerative Medicine, UCLA, California 90095, USA [3] Jonsson Cancer Research Center, UCLA, California 90095, USA [4] Molecular Biology Institute, UCLA, California 90095, USA
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Weigum SE, Castellanos-Gonzalez A, White AC, Richards-Kortum R. Amplification-free detection of Cryptosporidium parvum nucleic acids with the use of DNA/RNA-directed gold nanoparticle assemblies. J Parasitol 2013; 99:923-6. [PMID: 23617738 DOI: 10.1645/12-132.1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
This study describes the development and evaluation of an amplification-free molecular assay for detection of Cryptosporidium parvum oocysts. The assay employed a pair of oligonucleotide-functionalized gold nanoparticle (AuNP) probes that were complementary to adjacent sequences on C. parvum 18s rRNA. Hybridization of the probes to the target RNA resulted in the assembly of AuNPs into target-linked networks, which were detected both visibly and spectroscopically, by a redshift in the wavelength of light scattered by the gold nanoparticles. The limit of detection was between 4 × 10(5) and 4 × 10(6) copies of RNA per microliter reaction mix, when a short synthetic target or full-length in vitro transcribed target was employed. With total nucleic acids purified from C. parvum oocysts spiked into 100-mg stool, as few as 670 oocysts/μl reaction mix were detected. The ability to detect the nucleic acids of C. parvum oocysts in stool, without the need for complex amplification, offers unique advantages for such AuNP aggregation assays to be extended toward use in resource-limited settings where protozoan detection is needed most.
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Affiliation(s)
- S E Weigum
- Department of Biology, Texas State University, San Marcos, Texas 78666
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White AC, Barenghi CF, Proukakis NP, Youd AJ, Wacks DH. Nonclassical velocity statistics in a turbulent atomic Bose-Einstein condensate. Phys Rev Lett 2010; 104:075301. [PMID: 20366893 DOI: 10.1103/physrevlett.104.075301] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2009] [Revised: 01/26/2010] [Indexed: 05/29/2023]
Abstract
In a recent experiment Paoletti [Phys. Rev. Lett. 101, 154501 (2008)]10.1103/PhysRevLett.101.154501 monitored the motion of tracer particles in turbulent superfluid helium and inferred that the velocity components do not obey the Gaussian statistics observed in ordinary turbulence. Motivated by their experiment, we create a small 3D turbulent state in an atomic Bose-Einstein condensate, compute directly the velocity field, and find similar nonclassical power-law tails. We obtain similar results in 2D trapped and 3D homogeneous condensates, and in classical 2D vortex points systems. This suggests that non-Gaussian turbulent velocity statistics describe a fundamental property of quantum turbulence. We also track the decay of the vortex tangle in the presence of the thermal cloud.
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Affiliation(s)
- A C White
- School of Mathematics and Statistics, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom.
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Kovalszki A, Schumaker GL, Klein A, Terrin N, White AC. Reduced respiratory and skeletal muscle strength in survivors of sibling or unrelated donor hematopoietic stem cell transplantation. Bone Marrow Transplant 2008; 41:965-9. [PMID: 18264142 DOI: 10.1038/bmt.2008.15] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We performed a retrospective analysis of muscle strength testing obtained following sibling or unrelated donor hematopoietic stem cell transplant (HSCT) between 1 January 1999 and 31 December 2003 in a cohort of 44 subjects at Tufts-New England Medical Center. Maximal inspiratory pressure (PI(max)) was <or=80% predicted in 52% of subjects and <or=60% predicted in 20% of subjects; maximal expiratory pressure (PE(max)) was <or=80% predicted in 88% of subjects and <or=60% predicted in 74% of subjects. Patients with a PI(max) <or=60% predicted spent significantly longer time in hospital following HSCT compared with subjects with PI(max) 60% predicted. Grip strength (n=32) was reduced to <or=80% predicted in 75% of subjects and <or=60% predicted in 47% of subjects following HSCT. Analysis of paired measurements obtained before and after HSCT in 20 of the 44 subjects (45%) showed significant reduction in both PI(max) and PE(max) between the two measures. Respiratory and skeletal muscle weakness is present in a significant percentage of subjects undergoing pulmonary function testing in the post-HSCT period, and may contribute to pulmonary morbidity in subjects with pulmonary complications of HSCT.
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Affiliation(s)
- A Kovalszki
- Department of Medicine, Tufts-New England Medical Center, Tufts University School of Medicine, Boston, MA, USA
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Nash TE, Singh G, White AC, Rajshekhar V, Loeb JA, Proaño JV, Takayanagui OM, Gonzalez AE, Butman JA, DeGiorgio C, Del Brutto OH, Delgado-Escueta A, Evans CAW, Gilman RH, Martinez SM, Medina MT, Pretell EJ, Teale J, Garcia HH. Treatment of neurocysticercosis: current status and future research needs. Neurology 2006; 67:1120-7. [PMID: 17030744 PMCID: PMC2923067 DOI: 10.1212/01.wnl.0000238514.51747.3a] [Citation(s) in RCA: 135] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Here we put forward a roadmap that summarizes important questions that need to be answered to determine more effective and safer treatments. A key concept in management of neurocysticercosis is the understanding that infection and disease due to neurocysticercosis are variable and thus different clinical approaches and treatments are required. Despite recent advances, treatments remain either suboptimal or based on poorly controlled or anecdotal experience. A better understanding of basic pathophysiologic mechanisms including parasite survival and evolution, nature of the inflammatory response, and the genesis of seizures, epilepsy, and mechanisms of anthelmintic action should lead to improved therapies.
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Affiliation(s)
- T E Nash
- Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD, USA.
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White AC, Sousa AM, Blumberg J, Ryan HF, Fanburg BL, Kayyali US. Plasma antioxidants in subjects before hematopoietic stem cell transplantation. Bone Marrow Transplant 2006; 38:513-20. [PMID: 16980999 DOI: 10.1038/sj.bmt.1705475] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
UNLABELLED Chemo-irradiation induced oxidative damage to vascular endothelium may contribute to pulmonary complications of hematopoietic stem cell transplantation (HSCT). We measured antioxidants, markers of oxidative stress and plasma antioxidant capacity in plasma or serum from 24 subjects at day 7 before HSCT and 20 control subjects. The plasma concentration of extracellular glutathione peroxidase (GPX-3) was significantly reduced in the HSCT subjects compared with controls (HSCT: 98+/-42 microg/ml, control: 169+/-56 microg/ml, P<0.0001). The concentration of gamma-tocopherol was significantly higher in the HSCT subjects compared with controls (HSCT: 207+/-103 microg/dl; CONTROL 98+/-52 microg/dl; P=0.0002). The plasma concentrations of protein carbonyl, nitrotyrosine, malondialdehyde, alpha-tocopherol, vitamin A, homocysteine, cysteine and cysteinylglycine did not differ between HSCT and control subjects. Plasma from HSCT subjects was as effective as control plasma in quenching menadione-induced intracellular reactive oxygen species production in human microvascular endothelial cells. In summary, subjects before HSCT have significantly reduced plasma concentrations of GPX-3, elevated plasma gamma-tocopherol yet retains the ability to quench an acute oxidative stress. These changes may play a role in chronic oxidative stress in the HSCT population.
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Affiliation(s)
- A C White
- Pulmonary, Critical Care and Sleep Division, Department of Medicine, Tufts-New England Medical Center, Tupper Research Institute, Tufts University School of Medicine, Boston, MA, USA.
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Affiliation(s)
- C P Stewart
- The New Clinical Research Laboratory, Royal Infirmary of Edinburgh, and the Department of Pharmacology, Edinburgh University
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Affiliation(s)
- A C White
- The Department of Pharmacology, University of Edinburgh
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Affiliation(s)
- E Stedman
- The Department of Medical Chemistry, University of Edinburgh, and the Wellcome Physiological Research Laboratories, Langley Court, Beckenham
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Affiliation(s)
- C P Stewart
- The Departments of Therapeutics and Pharmacology, University of Edinburgh
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Baig S, Damian RT, Molinari JL, Tato P, Morales-Montor J, Welch M, Talhouk J, Hashmeys R, White AC. Purification and characterization of a metacestode cysteine proteinase from Taenia solium involved in the breakdown of human IgG. Parasitology 2005; 131:411-6. [PMID: 16178363 DOI: 10.1017/s0031182005007821] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Infection of the central nervous system by Taenia solium cysticerci is the cause of human neurocysticercosis, a major neurological infection in the Third World and an emerging infectious disease in the United States. We previously isolated a cysteine proteinase from cysticerci of Taenia crassiceps and demonstrated that it degrades human IgG in vitro. We have now isolated a 48 kDa thiol-dependent proteinase from T. solium. The T. solium enzyme also degrades human IgG, but does not significantly degrade albumin. IgG degradation was inhibited by cysteine proteinase inhibitors, but not significantly by inhibitors of aspartic, serine, or metalloproteinases. The peptide substrate specificity and pH optimum resemble cathepsin L. The Km for the peptide substrate Z-Phe-Arg-AFC was calculated to be 7.0 x 10(-6) M, the Kcat was 1.98 x 10(-5) s(-1), and the Kcat/Km 2.84 x 10(9) M(-1) s(-1), a value which is within the diffusion control limit for highly catalytic enzymes. We propose that immunoglobulin degradation by the T. solium cysteine proteinase may play a key role in the host-parasite interface and could be employed as a target for chemotherapy.
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Affiliation(s)
- S Baig
- Department of Cellular Biology, University of Georgia, Biological Sciences Building, Athens, GA 30603, USA
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Visnegarwala F, Graviss EA, Sajja P, Lahart CJ, White AC. Determinants of sustained virological suppression in indigent, HIV-infected patients: is single protease inhibitor-based antiretroviral therapy truly highly active? HIV Clin Trials 2004; 5:117-24. [PMID: 15248135 DOI: 10.1310/jq8u-6kvb-9jcg-jl51] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
BACKGROUND Effective virological suppression with HAART is dependent on strict adherence to therapy. Compliance with therapy is influenced by clinical and psychosocial factors. METHOD We performed a retrospective study investigating determinants of effective virological suppression, defined as <400 RNA at 11-13 months of HAART, in an urban indigent population. The study included 366 new patients presenting for care to the Thomas Street Clinic, Houston, Texas, between April and December 1998. Median age, CD4 count, and viral load (VL) of the study population were 37.5 years, 189 cells/mm(3), and 53,000, respectively. Thirty-nine percent had AIDS, 20% had cocaine-positive drug screens, and 64% were antiretroviral naïve. Two hundred and sixty-seven patients were started on HAART. Thirty-four percent showed virological suppression. RESULTS In multivariate analysis, adherence to HAART, care by experienced primary provider, baseline VL <100,000 copies/mL, age >35 years, and no active substance use were associated with virological suppression. Rates of virological suppression with HAART are unacceptably low in this urban indigent population. CONCLUSION Low rates of virological suppression are primarily due to lack of adherence rather than late utilization of care among ethnic minorities. Single protease-inhibitor-based antiretroviral therapy does not appear to be highly active in this patient population.
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Affiliation(s)
- F Visnegarwala
- Section of Infectious Diseases, Department of Medicine, Baylor College of Medicine, Houston, Texas, USA.
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Abstract
Neurocysticercosis is a common cause of neurological disease in developing countries and a major cause of epilepsy worldwide. A unique characteristic of human neurocysticercosis is that the living parasite is very well tolerated in human brain, so symptoms and clinical disease primarily result from death of the organism and accompanying inflammatory reaction in the human CNS. Among the diverse clinical manifestations of human neurocysticercosis, seizures are the most common, but other clinical problems occur, depending upon the localisation and viability of the parasite. Although both praziquantel and albendazole are effective agents, there is controversy about their role in several forms of the disease. Systematic reviews have pointed out the limited quality of available data on therapy. At a recent international conference convened to develop guidelines for treatment of this disease, areas of consensus and disagreement on the role of antiparasitic therapy were discussed. It was clear to all that cysticercosis cannot be regarded as a single disorder; treatment needs to be modified based on the location and number of cysticerci and the host response. There was a strong consensus that there is no role for antiparasitic drugs in patients with only calcified lesions. Studies suggest that patients with single enhancing lesions will do well regardless of antiparasitic therapy. Antiparasitic drugs are contraindicated in patients with cerebral oedema (cysticercal encephalitis). Most experts strongly recommend antiparasitic therapy in patients with multiple subarachnoid cysticerci or giant cysticerci. In patients with ventricular cysticerci, endoscopic removal is the preferred therapy. However, recent evidence suggests that placement of a ventricular shunt followed by antiparasitic therapy is an acceptable alternative. Standard treatment for localization-related epilepsy is effective for seizures caused by cysticercosis. In general, seizures are easily controlled in this illness. While many controversies regarding the treatment of patients with neurocysticercosis were not resolved at the international consensus conference, participants did conclude that controlled prospective studies are required to define optimal therapy for the infection and that treatment of infected individuals must be individualised.
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Affiliation(s)
- Terrence Riley
- Department of Neurology, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA.
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Abstract
Judgements about the health of clinical health care workers in relation to fitness to practice are made by a variety of doctors. These guidelines have been written to assist with such judgements and to facilitate equitable decision making in matters of employment.
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Affiliation(s)
- C J M Poole
- Dudley Priority Health NHS Trust, Health Centre, Cross Street, Dudley DY1 1RN, UK
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Del Brutto OH, Rajshekhar V, White AC, Tsang VC, Nash TE, Takayanagui OM, Schantz PM, Evans CA, Flisser A, Correa D, Botero D, Allan JC, Sarti E, Gonzalez AE, Gilman RH, García HH. Proposed diagnostic criteria for neurocysticercosis. Neurology 2001; 57:177-83. [PMID: 11480424 PMCID: PMC2912527 DOI: 10.1212/wnl.57.2.177] [Citation(s) in RCA: 489] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Neurocysticercosis is the most common helminthic infection of the CNS but its diagnosis remains difficult. Clinical manifestations are nonspecific, most neuroimaging findings are not pathognomonic, and some serologic tests have low sensitivity and specificity. The authors provide diagnostic criteria for neurocysticercosis based on objective clinical, imaging, immunologic, and epidemiologic data. These include four categories of criteria stratified on the basis of their diagnostic strength, including the following: 1) absolute--histologic demonstration of the parasite from biopsy of a brain or spinal cord lesion, cystic lesions showing the scolex on CT or MRI, and direct visualization of subretinal parasites by funduscopic examination; 2) major--lesions highly suggestive of neurocysticercosis on neuroimaging studies, positive serum enzyme-linked immunoelectrotransfer blot for the detection of anticysticercal antibodies, resolution of intracranial cystic lesions after therapy with albendazole or praziquantel, and spontaneous resolution of small single enhancing lesions; 3) minor--lesions compatible with neurocysticercosis on neuroimaging studies, clinical manifestations suggestive of neurocysticercosis, positive CSF enzyme-linked immunosorbent assay for detection of anticysticercal antibodies or cysticercal antigens, and cysticercosis outside the CNS; and 4) epidemiologic--evidence of a household contact with Taenia solium infection, individuals coming from or living in an area where cysticercosis is endemic, and history of frequent travel to disease-endemic areas. Interpretation of these criteria permits two degrees of diagnostic certainty: 1) definitive diagnosis, in patients who have one absolute criterion or in those who have two major plus one minor and one epidemiologic criterion; and 2) probable diagnosis, in patients who have one major plus two minor criteria, in those who have one major plus one minor and one epidemiologic criterion, and in those who have three minor plus one epidemiologic criterion.
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Affiliation(s)
- O H Del Brutto
- Department of Neurology, Hospital-Clinica Kennedy, Guayaquil, Ecuador.
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Robinson P, Okhuysen PC, Chappell CL, Lewis DE, Shahab I, Lahoti S, White AC. Expression of IL-15 and IL-4 in IFN-gamma-independent control of experimental human Cryptosporidium parvum infection. Cytokine 2001; 15:39-46. [PMID: 11509007 DOI: 10.1006/cyto.2001.0888] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We have previously demonstrated interferon gamma (IFN-gamma) in intestinal mucosa after experimental human Cryptosporidium parvum infection, but expression was limited to sensitized volunteers. To characterize IFN-gamma-independent mechanisms in control of infection, jejunal biopsies from immunocompetent volunteers experimentally challenged with C. parvum were examined by in situ hybridization for interleukin (IL-)15 and IL-4 mRNA with confirmation by immunohistochemistry. Cytokine expression was correlated with prechallenge anti- C. parvum IgG, symptoms, oocyst shedding, and prior IFN-gamma expression data. IL-15 expression was noted only in those without prior sensitization, who did not express IFN-gamma. By contrast, expression of IL-4 was associated with prior sensitization. IL-15 was only detected in those with symptoms (6/14 symptomatic vs 0/3 asymptomatic, P<0.05). Among 14 volunteers who did not express IFN-gamma, oocyst shedding was lower in those expressing IL-15. Overall, 14/15 volunteers who did not shed oocysts expressed either IFN-gamma or IL-15. There was no correlation between expression of IL-4 and symptoms or oocyst shedding. In conclusion, IL-15 expression was associated with control of oocyst shedding in those not expressing IFN-gamma. These data suggest that IL-15 is involved in IFN-gamma independent mechanisms of control of human cryptosporidiosis, perhaps via activation of the innate immune response.
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Affiliation(s)
- P Robinson
- Department of Medicine, Baylor College of Medicine, Houston, TX 77030, USA
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Colvin JS, White AC, Pratt SJ, Ornitz DM. Lung hypoplasia and neonatal death inFgf9-null mice identify this gene as an essential regulator of lung mesenchyme. Development 2001; 128:2095-106. [PMID: 11493531 DOI: 10.1242/dev.128.11.2095] [Citation(s) in RCA: 247] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Mammalian lung develops as an evagination of ventral gut endoderm into the underlying mesenchyme. Iterative epithelial branching, regulated by the surrounding mesenchyme, generates an elaborate network of airways from the initial lung bud. Fibroblast growth factors (FGFs) often mediate epithelial-mesenchymal interactions and mesenchymal Fgf10 is essential for epithelial branching in the developing lung. However, no FGF has been shown to regulate lung mesenchyme. In embryonic lung, Fgf9 is detected in airway epithelium and visceral pleura at E10.5, but is restricted to the pleura by E12.5. We report that mice homozygous for a targeted disruption of Fgf9 exhibit lung hypoplasia and early postnatal death. Fgf9−/− lungs exhibit reduced mesenchyme and decreased branching of airways, but show significant distal airspace formation and pneumocyte differentiation. Our results suggest that Fgf9 affects lung size by stimulating mesenchymal proliferation. The reduction in the amount of mesenchyme in Fgf9−/− lungs limits expression of mesenchymal Fgf10. We suggest a model whereby FGF9 signaling from the epithelium and reciprocal FGF10 signaling from the mesenchyme coordinately regulate epithelial airway branching and organ size during lung embryogenesis.
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Affiliation(s)
- J S Colvin
- Department of Molecular Biology and Pharmacology, Washington University Medical School, Campus Box 8103, 660 S. Euclid Avenue, St Louis, MO 63110, USA
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Abstract
Hypoxemia is a prevalent problem in the chronically critically ill patient. This article reviews the pathophysiologic mechanisms of hypoxemia in this patient population, discusses how oxygenation is evaluated, and reviews methods for delivery of oxygen. Other topics directly related to oxygen use, such as oxygen toxicity, heliox use, and portable oxygen devices, are included.
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Affiliation(s)
- A C White
- Department of Medicine, Pulmonary and Critical Care Division, New England Medical Center, Tufts University School of Medicine, Boston, Massachusetts, USA.
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Robinson P, Okhuysen PC, Chappell CL, Lewis DE, Shahab I, Janecki A, White AC. Expression of tumor necrosis factor alpha and interleukin 1 beta in jejuna of volunteers after experimental challenge with Cryptosporidium parvum correlates with exposure but not with symptoms. Infect Immun 2001; 69:1172-4. [PMID: 11160015 PMCID: PMC97999 DOI: 10.1128/iai.69.2.1172-1174.2001] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Jejunal biopsies from volunteers challenged with Cryptosporidium parvum were examined for tumor necrosis factor alpha (TNF-alpha) and interleukin (IL)-1 beta mRNA. Postchallenge biopsies from 15 of 28 (54%) volunteers expressed TNF-alpha; 14% expressed IL-1 beta. Cytokine expression did not correlate with enteric symptoms, suggesting that TNF-alpha and IL-1 beta are not key mediators of diarrhea in human cryptosporidiosis.
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Affiliation(s)
- P Robinson
- Department of Medicine, Baylor College of Medicine, Houston, Texas 77030, USA
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Murphy RL, Brun S, Hicks C, Eron JJ, Gulick R, King M, White AC, Benson C, Thompson M, Kessler HA, Hammer S, Bertz R, Hsu A, Japour A, Sun E. ABT-378/ritonavir plus stavudine and lamivudine for the treatment of antiretroviral-naive adults with HIV-1 infection: 48-week results. AIDS 2001; 15:F1-9. [PMID: 11192874 DOI: 10.1097/00002030-200101050-00002] [Citation(s) in RCA: 173] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVE To evaluate the safety and antiviral activity of different dose levels of the HIV protease inhibitor ABT-378 combined with low-dose ritonavir, plus stavudine and lamivudine in antiretroviral-naive individuals. DESIGN Prospective, randomized, double-blind, multicenter. METHODS Eligible patients with plasma HIV-1 RNA > 5000 copies/ml received ABT-378 200 or 400 mg with ritonavir 100 mg every 12 h; after 3 weeks stavudine 40 mg and lamivudine 150 mg every 12 h were added (group I, n = 32). A second group initiated treatment with ABT-378 400 mg and ritonavir 100 or 200 mg plus stavudine and lamivudine every 12 h (group II, n = 68). RESULTS Mean baseline HIV-1 RNA was 4.9 log10 copies/ml in both groups and CD4 cell count was 398 x 10(6)/l and 310 x 10(6)/l in Groups I and II respectively. In the intent-to-treat (ITT; missing value = failure) analysis at 48 weeks, HIV-1 RNA was < 400 copies/ml for 91% (< 50 copies/ml, 75%) and 82% (< 50 copies/ml, 79%) of patients in groups I and II respectively. Mean steady-state ABT-378 trough concentrations exceeded the wild-type HIV-1 EC50 (effective concentration to inhibit 50%) by 50-100-fold. The most common adverse events were abnormal stools, diarrhea and nausea. No patient discontinued before 48 weeks because of treatment-related toxicity or virologic rebound. CONCLUSIONS ABT-378 is a potent, well-tolerated protease inhibitor. The activity and durable suppression of HIV-1 observed in this study is probably attributable to the observed tolerability profile and the achievement of high ABT-378 plasma concentrations.
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Affiliation(s)
- R L Murphy
- Department of Medicine, Northwestern University, Chicago, IL 60611, USA
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Sharma MD, Sagar B, Wang S, White AC, Balasubramanyam A. High frequency of serious infections in patients with panhypopituitarism: a case-control study. Clin Infect Dis 2001; 32:153-8. [PMID: 11112672 DOI: 10.1086/317533] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2000] [Revised: 05/19/2000] [Indexed: 11/04/2022] Open
Abstract
We reviewed the records of 65 patients with panhypopituitarism (PHP) for the frequency and types of infections requiring hospitalization, and documented serious infections in 13 of 65 patients with PHP. The increased frequency of serious infectious diseases in patients with PHP is likely to contribute to increased age-specific mortality.
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Affiliation(s)
- M D Sharma
- Division of Endocrinology, Baylor College of Medicine, Houston, TX 77030, USA.
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Dunne M, Fessel J, Kumar P, Dickenson G, Keiser P, Boulos M, Mogyros M, White AC, Cahn P, O'Connor M, Lewi D, Green S, Tilles J, Hicks C, Bissett J, Schneider MM, Benner R. A randomized, double-blind trial comparing azithromycin and clarithromycin in the treatment of disseminated Mycobacterium avium infection in patients with human immunodeficiency virus. Clin Infect Dis 2000; 31:1245-52. [PMID: 11073759 DOI: 10.1086/317468] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/1999] [Revised: 05/24/2000] [Indexed: 11/04/2022] Open
Abstract
Two hundred and forty-six patients infected with human immunodeficiency virus (HIV) who also had disseminated Mycobacterium avium complex received either azithromycin 250 mg every day, azithromycin 600 mg every day, or clarithromycin 500 mg twice a day, each combined with ethambutol, for 24 weeks. Samples drawn from patients were cultured and clinically assessed every 3 weeks up to week 12, then monthly thereafter through week 24 of double-blind therapy and every 3 months while on open-label therapy through the conclusion of the trial. The azithromycin 250 mg arm of the study was dropped after an interim analysis showed a lower rate of clearance of bacteremia. At 24 weeks of therapy, the likelihood of patients' developing 2 consecutive negative cultures (46% vs. 56%, P=.24) or 1 negative culture (59% vs. 61%, P=.80) was similar for azithromycin 600 mg (n=68) and clarithromycin (n=57), respectively. The likelihood of relapse was 39% versus 27% (P=.21) on azithromycin compared with clarithromycin, respectively. Of the 6 patients who experienced relapse, none of those randomized to receive azithromycin developed isolates resistant to macrolides, compared with 2 of 3 patients randomized to receive clarithromycin [corrected]. Mortality was similar in patients comprising each arm of the study (69% vs. 63%; hazard, 95.1% confidence interval, 1.1 [0.7, 1.7]). Azithromycin 600 mg, when given in combination with ethambutol, is an effective agent for the treatment of disseminated M. avium disease in patients infected with HIV.
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Affiliation(s)
- M Dunne
- Pfizer Central Research, Groton, CT 06340, USA.
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35
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Leano AM, Miller K, White AC. Chronic graft-versus-host disease-related polymyositis as a cause of respiratory failure following allogeneic bone marrow transplant. Bone Marrow Transplant 2000; 26:1117-20. [PMID: 11108314 DOI: 10.1038/sj.bmt.1702688] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
An unusual case of respiratory failure and dropped head syndrome as a complication of severe chronic graft-versus-host disease (GVHD)-related polymyositis is described. The patient required tracheostomy and mechanical ventilation but recovered following treatment with aggressive immunosuppression and intensive rehabilitation. The differential diagnoses of muscle weakness in the bone marrow transplant (BMT) patient and the dropped head syndrome are both discussed. To our knowledge, this is the first reported case of respiratory failure requiring mechanical ventilation occurring as a complication of GVHD-related polymyositis.
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Affiliation(s)
- A M Leano
- Department of Medicine, New England Medical Center, Tufts University School of Medicine, Tupper Research Institute, Boston, MA 02111, USA
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Haas DW, Arathoon E, Thompson MA, de Jesus Pedro R, Gallant JE, Uip DE, Currier J, Noriega LM, Lewi DS, Uribe P, Benetucci L, Cahn P, Paar D, White AC, Collier AC, Ramirez-Ronda CH, Harvey C, Chung MO, Mehrotra D, Chodakewitz J, Nguyen BY. Comparative studies of two-times-daily versus three-times-daily indinavir in combination with zidovudine and lamivudine. AIDS 2000; 14:1973-8. [PMID: 10997402 DOI: 10.1097/00002030-200009080-00013] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVES To compare the efficacy and safety of two-times-daily versus three-times-daily indinavir in combination with zidovudine and lamivudine. DESIGN Two multicenter, open-label, randomized 24-week studies. METHODS Adults HIV-1 infection, HIV-1 RNA greater than 10000 copies/ml, and no prior lamivudine or protease inhibitor therapy were eligible. In a pilot study (Study A), patients received indinavir at 800 mg every 8 h, 1000 mg every 12 h, or 1200 mg every 12 h. In a subsequent study (Study B), patients received indinavir at 800 mg every 8 h or 1200 mg every 12 h. All subjects received zidovudine (300 mg) and lamivudine (150 mg) every 12 h. An intent-to-treat analysis was used. RESULTS In Study A, which enrolled 88 patients, neither HIV-1 RNA nor CD4 cell responses differed significantly between treatment groups at 24 weeks when corrected for multiple comparisons. Study B enrolled 433 patients, but was prematurely discontinued when interim analysis suggested greater efficacy of three-times-daily indinavir. Of the first 87 patients reaching week 24, HIV-1 RNA was less than 400 copies/ml in 91% receiving three-times-daily versus 64% receiving two-times-daily indinavir (P < 0.01). CONCLUSION Three-times-daily indinavir appears more efficacious than two-times-daily dosing when administered with zidovudine and lamivudine. Two-times-daily indinavir dosing should only be considered in situations characterized by favorable pharmacokinetic drug-drug interactions.
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Affiliation(s)
- D W Haas
- Vanderbilt University School of Medicine, Nashville, Tennessee 37212, USA.
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Robinson P, Okhuysen PC, Chappell CL, Lewis DE, Shahab I, Lahoti S, White AC. Transforming growth factor beta1 is expressed in the jejunum after experimental Cryptosporidium parvum infection in humans. Infect Immun 2000; 68:5405-7. [PMID: 10948171 PMCID: PMC101805 DOI: 10.1128/iai.68.9.5405-5407.2000] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Biopsies from volunteers challenged with Cryptosporidium parvum were examined for transforming growth factor beta1 (TGF-beta1). None of the prechallenge biopsies exhibited TGF-beta. Seven of 12 volunteers with oocyst shedding expressed TGF-beta versus 2 of 13 volunteers without detected oocysts. The association of TGF-beta expression with oocyst excretion and the timing of symptoms suggests that TGF-beta mediates intestinal healing.
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Affiliation(s)
- P Robinson
- Department of Molecular Virology, Baylor College of Medicine, Houston, Texas 77030, USA
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Abstract
Neurocysticercosis is now recognized as a common cause of neurologic disease in developing countries and the United States. The pathogenesis and clinical manifestations vary with the site of infection and accompanying host response. Inactive infection should be treated symptomatically. Active parenchymal infection results from an inflammatory reaction to the degenerating cysticercus and will also respond to symptomatic treatment. Controlled trials have not demonstrated a clinical benefit for antiparasitic drugs. Ventricular neurocysticercosis often causes obstructive hydrocephalus. Surgical intervention, especially cerebrospinal fluid diversion, is the key to management of hydrocephalus. Shunt failure may be less frequent when patients are treated with prednisone and/or antiparasitic drugs. Subarachnoid cysticercosis is associated with arachnoiditis. The arachnoiditis may result in meningitis, vasculitis with stroke, or hydrocephalus. Patients should be treated with corticosteroids, antiparasitic drugs, and shunting if hydrocephalus is present.
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Affiliation(s)
- A C White
- Department of Medicine, Baylor College of Medicine, Houston, Texas 77030, USA.
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DiFresco V, Landman M, Jaber BL, White AC. Dialysis disequilibrium syndrome: an unusual cause of respiratory failure in the medical intensive care unit. Intensive Care Med 2000; 26:628-30. [PMID: 10923740 DOI: 10.1007/s001340051214] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We describe a case of the dialysis disequilibrium syndrome (DDS) that was marked by the rapid onset of cerebral edema and the subsequent development of acute respiratory failure. The patient was treated successfully with a combination of mechanical hyperventilation and mannitol. The clinical presentation, pathogenesis, prevention and treatment of the entity are discussed.
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Affiliation(s)
- V DiFresco
- Department of Medicine, New England Medical Center, Tufts University School of Medicine, Tupper Research Institute, Boston, MA 02111, USA
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41
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Graviss EA, Vanden Heuvel EA, Lacke CE, Spindel SA, White AC, Hamill RJ. Clinical prediction model for differentiation of disseminated Histoplasma capsulatum and Mycobacterium avium complex infections in febrile patients with AIDS. J Acquir Immune Defic Syndr 2000; 24:30-6. [PMID: 10877492 DOI: 10.1097/00126334-200005010-00005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Disseminated infection with Histoplasma capsulatum and Mycobacterium avium complex (MAC) in patients with AIDS are frequently difficult to distinguish clinically. METHODS We retrospectively compared demographic information, other opportunistic infections, medications, symptoms, physical examination findings and laboratory parameters at the time of hospital presentation for 32 patients with culture documented disseminated histoplasmosis and 58 patients with disseminated MAC infection. RESULTS Positive predictors of histoplasma infection by univariate analysis included lactate dehydrogenase level, white blood cell (WBC) count, platelet count, alkaline phosphatase level, and CD4 cell count. By multivariate logistic regression analysis, those characteristics that remained significant included a lactate dehydrogenase value > or =500 U/L (risk ratio [RR], 42; 95% confidence interval [CI], 18.53-97.5; p < .001), alkaline phosphatase < or =300 U/L (RR, 9.35; 95% CI, 2.61-33.48; p = .008), WBC < or =4.5 x 10(6)/L (RR, 21.29; 95% CI, 6.79-66.75; p = .008), and CD4 cell count (RR, 0.958; 95% CI, 0.946-0.971; p = .001). CONCLUSIONS A predictive model for distinguishing disseminated histoplasmosis from MAC infection was developed using lactate dehydrogenase and alkaline phosphatase levels as well as WBC count. This model had a sensitivity of 83%, a specificity of 91%, and a misclassification rate of 13%.
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Affiliation(s)
- E A Graviss
- Section of Infectious Diseases, Veterans Affairs Medical Center, Houston, Texas 77030-4211, USA
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42
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Molinari JL, Mejia H, White AC, Garrido E, Borgonio VM, Baig S, Tato P. Taenia solium: a cysteine protease secreted by metacestodes depletes human CD4 lymphocytes in vitro. Exp Parasitol 2000; 94:133-42. [PMID: 10831377 DOI: 10.1006/expr.2000.4490] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Excreted/secreted products from Taenia solium metacestodes cultured in vitro were analyzed for peptidase activity using peptide substrates Z-Phe-Arg-AFC, Arg-AFC, and Z-Gly-Gly-Arg-AFC and zymography studies. Specific inhibitor profiles revealed mainly cysteine and metalloprotease activities. Hydrolysis of substrate Z-Phe-Arg-AFC was augmented by the addition of L-cysteine and acid pH, consistent with cysteine protease activity. Cysteine protease activity was more prominent in supernatants from living metacestodes cultured in PBS than in either RPMI or RPMI plus fetal calf serum and was proportional to the number of metacestodes. Flow cytometry analysis showed depletion of human T lymphocytes cultured with living T. solium metacestodes. CD4(+) expression was significantly decreased when metacestode E/S products and L-cysteine were added to lymphocyte cultures (P = 0.027). This peptidase activity was inhibited by E-64 indicating that the depletion of CD4(+) cells was due to cysteine protease activity. Thus, T. solium metacestodes produce excretory/secretory proteases. These enzymes may cleave molecules critical for the host immune response allowing the parasites to survive in the host tissues.
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Affiliation(s)
- J L Molinari
- Department of Molecular Genetics, Institute of Cellular Physiology, UNAM, Mexico, DF
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White AC, Robinson P, Okhuysen PC, Lewis DE, Shahab I, Lahoti S, DuPont HL, Chappell CL. Interferon-gamma expression in jejunal biopsies in experimental human cryptosporidiosis correlates with prior sensitization and control of oocyst excretion. J Infect Dis 2000; 181:701-9. [PMID: 10669358 DOI: 10.1086/315261] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
To investigate the role of interferon (IFN)-gamma in human cryptosporidiosis, jejunal biopsies from experimentally infected volunteers and chronically infected AIDS patients were examined for IFN-gamma expression by in situ hybridization. IFN-gamma expression was compared with oocyst excretion, baseline serum anti-Cryptosporidium antibody, and symptoms. IFN-gamma mRNA was detected in biopsies from 13 of 26 volunteers after experimental infection but not in biopsies taken before C. parvum exposure or in biopsies from patients with AIDS-associated cryptosporidiosis. After challenge, 9 of 10 volunteers with baseline C. parvum antibody produced IFN-gamma, compared with 4 of 16 volunteers without baseline antibody (P<.01). Furthermore, IFN-gamma mRNA was detected in 9 of 13 volunteers who did not excrete oocysts, compared with 4 of 13 with organisms (P<.05). Thus, expression of IFN-gamma in the jejunum was associated with prior sensitization and absence of oocyst shedding. IFN-gamma production may explain the resistance to infection noted in sensitized persons but may not be involved in control of human primary infection.
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Affiliation(s)
- A C White
- Infectious Diseases Section, Dept. of Medicine, Baylor College of Medicine, Houston, TX 77030.
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Keitel WA, Kester KE, Atmar RL, White AC, Bond NH, Holland CA, Krzych U, Palmer DR, Egan A, Diggs C, Ballou WR, Hall BF, Kaslow D. Phase I trial of two recombinant vaccines containing the 19kd carboxy terminal fragment of Plasmodium falciparum merozoite surface protein 1 (msp-1(19)) and T helper epitopes of tetanus toxoid. Vaccine 1999; 18:531-9. [PMID: 10519944 DOI: 10.1016/s0264-410x(99)00221-2] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The safety and immunogenicity of 2 yeast-derived, blood-stage malaria vaccines were evaluated in a phase l trial. Healthy adults were given 2 or 3 doses of alum-adsorbed vaccine containing the 19 kDa carboxy-terminal fragment of the merozoite surface protein-1 (MSP-1(19)) derived from the 3D7 or the FVO strain of Plasmodium falciparum fused to tetanus toxoid T-helper epitopes P30 and P2. The first 2 doses of MSP-1(19) were well tolerated. Hypersensitivity reactions occurred in 3 subjects after the third dose of MSP-1(19), including bilateral injection site reactions in 2 (one with generalized skin rash), and probable histamine-associated hypotension in 1. Serum antibody responses to MSP-1(19) occurred in 5/16, 9/16 and 0/8 subjects given 20 microg of MSP-1(19), 200 microg of MSP-1(19), and control vaccines (hepatitis B or Td), respectively. Both MSP-1(19) vaccines were immunogenic in humans, but changes in formulation will be necessary to improve safety and immunogenicity profiles.
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Affiliation(s)
- W A Keitel
- Department of Microbiology & Immunology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA.
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Abstract
Intestinal parasites remain extremely common worldwide. In developing countries, intestinal protozoans are important causes of childhood diarrhea. Cryptosporidiosis is a common cause of chronic diarrhea in patients with AIDS. With the advent of current active antiretroviral therapy the incidence of cryptosporidiosis in AIDS has decreased. By contrast, Cryptosporidium, Cyclospora, and Giardia outbreaks continue to be associated with contamination of food or water. The intestinal helminths Ascaris, hookworm, and Trichuris each infects over a thousand million people. While most of those infected experience only minor symptoms, recent data highlight subtle effects of parasitism on cognitive function and nutrition. Efforts at disease control in developing countries are increasingly focused on mass chemotherapy.
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Affiliation(s)
- P C Okhuysen
- Division of Infectious Diseases, Department of Internal Medicine, University of Texas Medical School, Baylor College of Medicine, Houston, Texas 77030, USA
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Abstract
Transforming growth factor beta (TGFbeta) may play an important role in diseases characterized by pulmonary fibrosis. We have previously demonstrated that thiols inhibit the pro-oxidant effects of TGFbeta1 in bovine pulmonary artery endothelial cells (BPAEC). To help define the mechanism of this observation we have examined the effect of reduced (GSH) and oxidized (GSSG) glutathione, N-acetyl cysteine (NAC) and cysteine (CYS) on the biological activity of a) TGFbeta released by bovine pulmonary artery endothelial cells (BPAEC) into culture medium, and b) commercially available porcine platelet TGFbeta1. The biological activity of TGFbeta (following activation) released into the medium from cultured BPAEC was significantly reduced when the cells were cultured in the presence of 10 mM GSH or 10 mM NAC for 24 h (10 mM GSH: 85.7 +/- 50 pg/ml/10(6) cells and 10 mM NAC: 127.3 +/- 35 pg/ml/10(6) cells, compared with control: 541 +/- 8.9 pg/ml/10(6) cells; p < 0.05). Thiols (10 mM GSH, 10 mM NAC and 5 mM cysteine), added directly to cell-free conditioned medium or to a commercially available preparation of porcine platelet TGFbeta1 for 6-24 h had a similar inhibitory effect on the biological activity of TGFbeta and altered the structure of porcine platelet TGFbeta1 as determined by mass spectroscopy. These thiols failed to reduce the expression of TGFbeta mRNA in BPAEC as measured by a competitive polymerase chain reaction assay. Incubating endothelial cells or cell-free conditioned medium with GSSG did not alter the biological activity of TGFbeta. Lower doses of thiols (0.1-1 mM), that we have shown inhibit the antiproliferative and pro-oxidant effects of exogenous TGFbeta1 on BPAEC, had no direct effect on TGFbeta bioactivity. In summary, thiols are capable of reducing the effects of TGFbeta in biological systems through a direct effect on the TGFbeta molecule. However, this action appears to be dose-dependent, and at low doses (0.1-1 mM) thiols may also inhibit the actions of exogenous TGFbeta1 in cell culture through a mechanism involving the cellular redox status.
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Affiliation(s)
- A C White
- Department of Medicine/Tupper Research Institute, New England Medical Center/Tufts University School of Medicine, Boston, MA 02111, USA.
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Affiliation(s)
- M E Carlini
- Department of Medicine, Ben Taub General Hospital and Baylor College of Medicine, Houston, Texas 77030, USA
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Havlir DV, Dubé MP, McCutchan JA, Forthal DN, Kemper CA, Dunne MW, Parenti DM, Kumar PN, White AC, Witt MD, Nightingale SD, Sepkowitz KA, MacGregor RR, Cheeseman SH, Torriani FJ, Zelasky MT, Sattler FR, Bozzette SA. Prophylaxis with weekly versus daily fluconazole for fungal infections in patients with AIDS. Clin Infect Dis 1998; 27:1369-75. [PMID: 9868644 DOI: 10.1086/515018] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
We compared the efficacy of a 400-mg once-weekly dosage versus a 200-mg daily dosage of fluconazole for the prevention of deep fungal infections in a multicenter, randomized, double-blind trial of 636 human immunodeficiency virus-infected patients to determine if a less intensive fluconazole regimen could prevent these serious but relatively infrequent complications of AIDS. In the intent-to-treat analysis, a deep fungal infection developed in 17 subjects (5.5%) randomly assigned to daily fluconazole treatment and in 24 (7.7%) given weekly fluconazole during 74 weeks of follow-up (risk difference, 2.2%; 95% confidence interval [CI], -1.7% to 6.1%). Thrush occurred twice as frequently in the weekly versus daily fluconazole recipients (hazard ratio, 0.59; 95% CI, 0.40-0.89), and in a subset of patients evaluated, fluconazole resistance was infrequent. Fluconazole administered once weekly is effective in reducing deep fungal infections in patients with AIDS, but this dosage is less effective than the 200-mg-daily dosage in preventing thrush.
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Affiliation(s)
- D V Havlir
- University of California, San Diego, USA
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Abstract
Unlike the elderly, healthy middle aged adults are at relatively low risk of acquiring serious pneumococcal disease. An explanation that has been proposed is that people in this age group have significant amounts of serum antibody (primarily IgG2) that react with any pneumococcal capsular polysaccharide serotypes. The level of antibody can be as high as several hundred micrograms per milliliter of blood for some serotypes. A significant component of this reactivity is directed toward the conserved C-polysaccharide depletion. Even after C-polysaccharide depletion, which is included as a routine part of the assay to determine antibody levels, resting antibody levels in a normal healthy adult population can vary widely. We have analyzed the reactivity of serum from 76 people to 16 pneumococcal capsular polysaccharide serotypes. The antibody reactivities to 13 of 16 serotypes are highly correlated with one another. Depletion of serum with C-polysaccharide and purified capsular polysaccharide inhibited antibody binding to type specific capsular polysaccharide. Cross-serotype inhibition of antibody binding was also observed. This indicates that there are materials contained within the pneumococcal polysaccharides that contribute to the cross-reactivity of serum antibodies in people that have not been vaccinated with the pneumococcal vaccine.
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Affiliation(s)
- R T Coughlin
- Aquila Biopharmaceuticals Inc., Framingham, MA 01702-5404, USA
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Hosseinipour MC, Smith NH, Simpson EP, Greenberg SB, Armstrong RM, White AC. Middle cerebral artery vasculitis and stroke after varicella in a young adult. South Med J 1998; 91:1070-2. [PMID: 9824195 DOI: 10.1097/00007611-199811000-00018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Varicella-zoster virus infection has been implicated in a broad range of neurologic complications. In Hispanic immigrants, primary varicella often appears in adolescents and young adults. We describe the case of a 20-year-old Hispanic man with vasculitis and stroke after primary varicella infection. An association between varicella infection and vasculitis is increasingly being described and should be considered in the evaluation of stroke in young adults.
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Affiliation(s)
- M C Hosseinipour
- Department of Medicine, Baylor College of Medicine and Ben Taub General Hospital, Houston, Tex 77030, USA
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