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Pannaraj PS. Influenza Antivirals in Pediatrics: Why Aren't We Using All the Available Tools? Pediatrics 2023; 152:e2023063481. [PMID: 37953646 DOI: 10.1542/peds.2023-063481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 09/21/2023] [Indexed: 11/14/2023] Open
Affiliation(s)
- Pia S Pannaraj
- University of California, San Diego; Rady Children's Hospital, San Diego, California
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2
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O’Leary ST, Campbell JD, Ardura MI, Banerjee R, Bryant KA, Caserta MT, Frenck RW, Gerber JS, John CC, Kourtis AP, Myers A, Pannaraj P, Ratner AJ, Shah SS, Bryant KA, Hofstetter AM, Chaparro JD, Michel JJ, Kimberlin DW, Barnett ED, Lynfield R, Sawyer MH, Bernstein HH, Cardemil CV, Farizo KM, Kafer LM, Kim D, López Medina E, Moore D, Panagiotakopoulos L, Romero JR, Sauvé L, Starke JR, Thompson J, Wharton M, Woods CR, Frantz JM, Gibbs G. Recommendations for Prevention and Control of Influenza in Children, 2023-2024. Pediatrics 2023; 152:e2023063773. [PMID: 37641884 DOI: 10.1542/peds.2023-063773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 07/28/2023] [Indexed: 08/31/2023] Open
Abstract
This technical report accompanies the recommendations of the American Academy of Pediatrics for the routine use of influenza vaccine and antiviral medications in the prevention and treatment of influenza in children during the 2023-2024 season. The rationale for the American Academy of Pediatrics recommendation for annual influenza vaccination of all children without medical contraindications starting at 6 months of age is provided. Influenza vaccination is an important strategy for protecting children and the broader community against influenza. This technical report summarizes recent influenza seasons, morbidity and mortality in children, vaccine effectiveness, and vaccination coverage, and provides detailed guidance on vaccine storage, administration, and implementation. The report also provides a brief background on inactivated and live-attenuated influenza vaccines, available vaccines this season, vaccination during pregnancy and breastfeeding, diagnostic testing for influenza, and antiviral medications for treatment and chemoprophylaxis. Strategies to promote vaccine uptake are emphasized.
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3
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Ruiz-Spinelli A, Waterer G, Rello J. Severe community-acquired pneumonia in the post COVID-19 era. Curr Opin Crit Care 2023; 29:400-406. [PMID: 37641523 DOI: 10.1097/mcc.0000000000001083] [Citation(s) in RCA: 0] [Impact Index Per Article: 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: 08/31/2023]
Abstract
PURPOSE OF REVIEW The aim was to examine and summarize the most recent published literature in the last years stating the advances for treatment options and adjunctive therapies in patients hospitalized with severe community-acquired pneumonia (sCAP). Search was performed in PubMed, including observational studies, randomized controlled trials, systematic reviews and meta-analyses, and international guidelines. RECENT FINDINGS Regardless of a large number of published CAP guidelines, most of their recommendations are based on low-level evidence.Viruses have an increasing role as sCAP etiology with an impact on mortality. Accordingly, it is imperative to strengthen the demand for vaccines and newer antivirals. Considering an early monitoring of the immune response in patients with severe Influenza, may help to evaluate a personalized immunomodulatory strategy. Despite growing evidence, the use of corticosteroids as an adjunctive therapy in bacterial sCAP continues to be controversial. SUMMARY Mortality due to sCAP still remains undesirably high. This fact strengthens the need for more high-quality research to increase evidence. It also highlights the need for clinicians to be aware of the level of evidence of the stated recommendations, taking this into consideration before decision making.
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Affiliation(s)
- Alfonsina Ruiz-Spinelli
- Intensive Care Unit, Department of Critical Care, Hospital de Clínicas, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
- Department of Medicine, Universitat Internacional de Catalunya (UIC), Barcelona, Spain
| | - Grant Waterer
- Respiratory Department, University of Western Australia, Royal Perth Hospital, Perth, Australia
| | - Jordi Rello
- Global Health eCore, Vall d'Hebron Institute of Research (VHIR), Barcelona
- Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III, Madrid, Spain
- Unité de Recherche FOVERA, Réanimation Douleur Urgences, Centre Hospitalier Universitaire de Nîmes, Nîmes, France
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Huang G, Tian Y, Cui W, Zhang X, Zhao Y, Liu X. Rapid health technology assessment of the novel endonuclease inhibitor baloxavir for the treatment of influenza. J Chemother 2023:1-16. [PMID: 37767970 DOI: 10.1080/1120009x.2023.2263270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 03/30/2023] [Accepted: 09/21/2023] [Indexed: 09/29/2023]
Abstract
Through a Rapid Health Technology Assessment (RHTA), we evaluated the efficacy, safety and cost-effectiveness of baloxavir in the treatment of influenza, providing the necessary scientific information and evidence-based basis for healthcare professionals and health insurance decision-makers in making rational selections. Through systematic searches of Pubmed, Embase, Web of Science, The Cochrane Register of Clinical Trials database and the official website of Health Technology Assessment (HTA) agencies, we collected systematic reviews (SR)/Meta-analysis, cost-effectiveness evaluations and HTA reports of baloxavir for influenza, with a search time frame of date of database establishment to July 31, 2022. We then performed data extraction, literature screening and quality evaluation on the literature that met our selection criteria, after which the results of the studies were pooled and qualitatively described for analysis. 10 studies were included, including 6 SR/Meta-analysis, three economics studies, and 1 HTA report. In terms of efficacy, baloxavir had an advantage over oseltamivir for all three types of influenza patients (otherwise healthy patients, high-risk patients, and patients are not separated into groups with and without underlying health conditions) concerning change in virus titer from baseline at 24 and 48 h; about otherwise healthy patients and high-risk patients, baloxavir had an advantage over peramivir; pertaining to high-risk patients, baloxavir had an advantage over laninamivir; the above differences between groups were all statistically significant. In terms of safety, in otherwise healthy patients and patients are not separated into groups with and without underlying health conditions, baloxavir significantly reduced the incidence of DRAEs and nausea compared with oseltamivir, as well as significantly reduced the incidence of DRAEs compared with laninamivir; in patients are not separated into groups with and without underlying health conditions, baloxavir significantly reduced the incidence of AEs and diarrhoea compared with oseltamivir; the differences between the above groups were all statistically significant. Economically, in Japanese adult influenza patients and high-risk populations, the Quality-Adjusted Life Years (QALY) of baloxavir slightly triumphed over that of laninamivir (Δ = 0.000112 and 0.00209 QALY per 1 patient, respectively); moreover, the incremental cost-effectiveness ratio (ICER: 2,231,260 and 68,855 yen/QALY, respectively) was below the willingness-to-pay (WTP) threshold (5,000,000 yen/QALY); in Chinese adult influenza patients without underlying diseases and adult high-risk influenza patients, baloxavir had a higher QALY compared with oseltamivir (Δ = 0.000246 and 0.000186 respectively), however, their ICER (12,230 and 64,956 RMB/QALY) was above the local WTP threshold (10,000 RMB/QALY) and thus did not provide a cost-effectiveness advantage. Baloxavir had a favorable efficacy and safety profile compared to neuraminidase inhibitors (NAIs), and the currently available evidence suggested that it had an economic advantage only in Japan.
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Affiliation(s)
- Guangliang Huang
- The Second Hospital of HeBei Medical University, Shijiazhuang, China
| | - Yunfei Tian
- Department of Psychology, the University of Hong Kong, Hong Kong, China
| | - Wenyan Cui
- The Second Hospital of HeBei Medical University, Shijiazhuang, China
| | - Xinhui Zhang
- The Second Hospital of HeBei Medical University, Shijiazhuang, China
| | - Yonghong Zhao
- The Second Hospital of HeBei Medical University, Shijiazhuang, China
| | - Xiuju Liu
- The Second Hospital of HeBei Medical University, Shijiazhuang, China
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Nezu K, Hayashida S, Nagano N, Udagawa S, Morioka I. Early Fever Resolution in Early Childhood Influenza Treated with Baloxavir Marboxil: A Retrospective Study Compared to Those with Oseltamivir. Medicina (Kaunas) 2023; 59:1543. [PMID: 37763660 PMCID: PMC10533152 DOI: 10.3390/medicina59091543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Revised: 08/14/2023] [Accepted: 08/23/2023] [Indexed: 09/29/2023]
Abstract
Background and Objectives: Baloxavir marboxil is a novel cap-dependent endonuclease inhibitor prescribed for influenza treatment. Unlike neuraminidase inhibitors like oseltamivir, which impair viral release from infected host cells, baloxavir blocks influenza virus proliferation by inhibiting viral mRNA transcription. This study aimed to compare the effectiveness of baloxavir and oseltamivir for the treatment of early childhood influenza. Materials and Methods: Of 1410 patients diagnosed with influenza between 2015 and 2018 at a Japanese primary care outpatient clinic, 1111 pediatric patients aged 0-6 years who were treated with baloxavir (n = 555) or oseltamivir (n = 556) were enrolled retrospectively. The following clinical factors were compared between patients treated with baloxavir and oseltamivir: age, sex, time from fever onset to drug administration (<24 h or 24-48 h), time from drug administration to fever reduction, influenza type (A or B), and influenza vaccination before disease onset. The duration of the fever, which was used as an index of clinical effectiveness, was compared using the log-rank test. Clinical factors associated with fever duration were determined using multivariate logistic regression analysis. Results: Median age (3.0 vs. 2.5 years), influenza type A (99% vs. 47%), median duration from drug administration to fever resolution (1 day vs. 2 days), and influenza vaccination (done, 41% vs. not done, 65%) were significantly different between the baloxavir and oseltamivir groups (p < 0.001). The number of patients with a fever duration of one day was 553 (99.6%) in the baloxavir group and 6 (1.1%) in the oseltamivir group (p < 0.001). Baloxavir use was only significantly associated with fever duration in the multivariate analysis (odds ratio 50,201, p < 0.001). Apparent adverse effects were not observed in the baloxavir-treated group. Conclusions: Baloxavir treatment resulted in a shorter fever duration than oseltamivir treatment in early childhood influenza.
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Affiliation(s)
- Keiko Nezu
- Department of Pediatrics and Child Health, Nihon University School of Medicine, Tokyo 1738610, Japan; (K.N.); (S.H.); (N.N.)
- Nezu Clinic, Tokyo 1740042, Japan
| | - Shingo Hayashida
- Department of Pediatrics and Child Health, Nihon University School of Medicine, Tokyo 1738610, Japan; (K.N.); (S.H.); (N.N.)
| | - Nobuhiko Nagano
- Department of Pediatrics and Child Health, Nihon University School of Medicine, Tokyo 1738610, Japan; (K.N.); (S.H.); (N.N.)
| | - Seiichi Udagawa
- Mathematics Section, Division of Natural Sciences, Nihon University School of Medicine, Tokyo 1738610, Japan;
| | - Ichiro Morioka
- Department of Pediatrics and Child Health, Nihon University School of Medicine, Tokyo 1738610, Japan; (K.N.); (S.H.); (N.N.)
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Bulloch MN. Treatment and prevention of influenza in geriatric patients. Expert Rev Clin Pharmacol 2023; 16:825-841. [PMID: 37526068 DOI: 10.1080/17512433.2023.2243221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Accepted: 07/28/2023] [Indexed: 08/02/2023]
Abstract
INTRODUCTION Older adults are the most vulnerable population to the effects of influenza. These patients have age-related characteristics that make response to both infection and therapeutics different than younger patients. AREAS COVERED Influenza vaccination and antiviral therapy are the foundational approaches to preventing and treating influenza in geriatric patients. Older adults should receive one of the three enhanced vaccines before influenza season beings. There are five antivirals used in influenza. Geriatric patients have been under-enrolled in antiviral studies but have been included in small numbers. Oseltamivir has the most abundant evidence, including in the hospital and long-term care (LTC) facilities, and the strongest evidence for reducing mortality and complications. Peramivir offers the shortest time for symptom alleviation, while baloxavir is best tolerated. EXPERT OPINION Oseltamivir has the most versatility in preventing and treating influenza in geriatric patients. Parenteral peramivir and zanamivir are second-line alternatives for complicated influenza when oseltamivir cannot be used. Single-dose peramivir and baloxavir are attractive alternatives to oseltamivir in uncomplicated influenza but will not increase in utilization until more evidence is available regarding mortality and complications, particularly in hospitalized and LTC patients. More studies, including comparative trials, are required to elucidate the role in therapy for each therapeutic in the geriatric population.
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Affiliation(s)
- Marilyn N Bulloch
- Auburn University Harrison College of Pharmacy, Auburn, Alabama, United States
- Department of Family, Internal, and Rural Medicine, University of Alabama Heersink School of Medicine and University of Alabama College of Community Health Sciences, Tuscaloosa, Alabama, United States
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Kumari R, Sharma SD, Kumar A, Ende Z, Mishina M, Wang Y, Falls Z, Samudrala R, Pohl J, Knight PR, Sambhara S. Antiviral Approaches against Influenza Virus. Clin Microbiol Rev 2023; 36:e0004022. [PMID: 36645300 PMCID: PMC10035319 DOI: 10.1128/cmr.00040-22] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Preventing and controlling influenza virus infection remains a global public health challenge, as it causes seasonal epidemics to unexpected pandemics. These infections are responsible for high morbidity, mortality, and substantial economic impact. Vaccines are the prophylaxis mainstay in the fight against influenza. However, vaccination fails to confer complete protection due to inadequate vaccination coverages, vaccine shortages, and mismatches with circulating strains. Antivirals represent an important prophylactic and therapeutic measure to reduce influenza-associated morbidity and mortality, particularly in high-risk populations. Here, we review current FDA-approved influenza antivirals with their mechanisms of action, and different viral- and host-directed influenza antiviral approaches, including immunomodulatory interventions in clinical development. Furthermore, we also illustrate the potential utility of machine learning in developing next-generation antivirals against influenza.
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Affiliation(s)
- Rashmi Kumari
- Immunology and Pathogenesis Branch, Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
- Department of Anesthesiology, Jacobs School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, New York, USA
| | - Suresh D. Sharma
- Immunology and Pathogenesis Branch, Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Amrita Kumar
- Immunology and Pathogenesis Branch, Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Zachary Ende
- Immunology and Pathogenesis Branch, Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
- Oak Ridge Institute for Science and Education (ORISE), CDC Fellowship Program, Oak Ridge, Tennessee, USA
| | - Margarita Mishina
- Immunology and Pathogenesis Branch, Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Yuanyuan Wang
- Biotechnology Core Facility Branch, Division of Scientific Resources, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
- Association of Public Health Laboratories, Silver Spring, Maryland, USA
| | - Zackary Falls
- Department of Biomedical Informatics, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA
| | - Ram Samudrala
- Department of Biomedical Informatics, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA
| | - Jan Pohl
- Biotechnology Core Facility Branch, Division of Scientific Resources, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Paul R. Knight
- Department of Anesthesiology, Jacobs School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, New York, USA
| | - Suryaprakash Sambhara
- Immunology and Pathogenesis Branch, Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
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Abstract
This technical report accompanies the recommendations of the American Academy of Pediatrics for the routine use of influenza vaccine and antiviral medications in the prevention and treatment of influenza in children during the 2022 to 2023 season. The American Academy of Pediatrics recommends annual influenza vaccination of all children without medical contraindications starting at 6 months of age. Influenza vaccination is an important strategy for protecting children and the broader community as well as reducing the overall burden of respiratory illnesses when other viruses, including severe acute respiratory syndrome-coronavirus 2, are cocirculating. This technical report summarizes recent influenza seasons, morbidity and mortality in children, vaccine effectiveness, and vaccination coverage, and provides detailed guidance on storage, administration, and implementation. The report also provides a brief background on inactivated and live attenuated influenza vaccine recommendations, vaccination during pregnancy and breastfeeding, diagnostic testing, and antiviral medications for treatment and chemoprophylaxis. Updated information is provided about the 2021 to 2022 influenza season, influenza immunization rates, the effectiveness of influenza vaccination on hospitalization and mortality, available vaccines, guidance for patients with history of severe allergic reactions to prior influenza vaccinations, and strategies to promote vaccine uptake.
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Agamennone M, Fantacuzzi M, Vivenzio G, Scala MC, Campiglia P, Superti F, Sala M. Antiviral Peptides as Anti-Influenza Agents. Int J Mol Sci 2022; 23:11433. [PMID: 36232735 PMCID: PMC9569631 DOI: 10.3390/ijms231911433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 09/16/2022] [Accepted: 09/23/2022] [Indexed: 11/16/2022] Open
Abstract
Influenza viruses represent a leading cause of high morbidity and mortality worldwide. Approaches for fighting flu are seasonal vaccines and some antiviral drugs. The development of the seasonal flu vaccine requires a great deal of effort, as careful studies are needed to select the strains to be included in each year's vaccine. Antiviral drugs available against Influenza virus infections have certain limitations due to the increased resistance rate and negative side effects. The highly mutative nature of these viruses leads to the emergence of new antigenic variants, against which the urgent development of new approaches for antiviral therapy is needed. Among these approaches, one of the emerging new fields of "peptide-based therapies" against Influenza viruses is being explored and looks promising. This review describes the recent findings on the antiviral activity, mechanism of action and therapeutic capability of antiviral peptides that bind HA, NA, PB1, and M2 as a means of countering Influenza virus infection.
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Affiliation(s)
- Mariangela Agamennone
- Department of Pharmacy, University “G. d’Annunzio” of Chieti-Pescara, Via dei Vestini 31, 66100 Chieti, Italy
| | - Marialuigia Fantacuzzi
- Department of Pharmacy, University “G. d’Annunzio” of Chieti-Pescara, Via dei Vestini 31, 66100 Chieti, Italy
| | - Giovanni Vivenzio
- Department of Pharmacy, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Italy
| | - Maria Carmina Scala
- Department of Pharmacy, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Italy
| | - Pietro Campiglia
- Department of Pharmacy, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Italy
| | - Fabiana Superti
- National Centre for Innovative Technologies in Public Health, National Institute of Health, Viale Regina Elena 299, 00161 Rome, Italy
| | - Marina Sala
- Department of Pharmacy, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Italy
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Abstract
Annual seasonal influenza epidemics of variable severity caused by influenza A and B virus infections result in substantial disease burden worldwide. Seasonal influenza virus circulation declined markedly in 2020-21 after SARS-CoV-2 emerged but increased in 2021-22. Most people with influenza have abrupt onset of respiratory symptoms and myalgia with or without fever and recover within 1 week, but some can experience severe or fatal complications. Prevention is primarily by annual influenza vaccination, with efforts underway to develop new vaccines with improved effectiveness. Sporadic zoonotic infections with novel influenza A viruses of avian or swine origin continue to pose pandemic threats. In this Seminar, we discuss updates of key influenza issues for clinicians, in particular epidemiology, virology, and pathogenesis, diagnostic testing including multiplex assays that detect influenza viruses and SARS-CoV-2, complications, antiviral treatment, influenza vaccines, infection prevention, and non-pharmaceutical interventions, and highlight gaps in clinical management and priorities for clinical research.
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Affiliation(s)
- Timothy M Uyeki
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA.
| | - David S Hui
- Division of Respiratory Medicine and Stanley Ho Centre for Emerging Infectious Diseases, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong Special Administrative Region, China
| | - Maria Zambon
- Virology Reference Department, UK Health Security Agency, London, UK
| | - David E Wentworth
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Arnold S Monto
- Center for Respiratory Research and Response, Department of Epidemiology, University of Michigan, Ann Arbor, MI, USA
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Abstract
This technical report accompanies the recommendations of the American Academy of Pediatrics for the routine use of the influenza vaccine and antiviral medications in the prevention and treatment of influenza in children during the 2021-2022 season. Influenza vaccination is an important intervention to protect vulnerable populations and reduce the burden of respiratory illnesses during circulation of severe acute respiratory syndrome coronavirus 2, which is expected to continue during this influenza season. In this technical report, we summarize recent influenza seasons, morbidity and mortality in children, vaccine effectiveness, vaccination coverage, and detailed guidance on storage, administration, and implementation. We also provide background on inactivated and live attenuated influenza vaccine recommendations, vaccination during pregnancy and breastfeeding, diagnostic testing, and antiviral medications for treatment and chemoprophylaxis.
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MESH Headings
- Antiviral Agents/therapeutic use
- Breast Feeding
- Child
- Contraindications, Drug
- Drug Resistance, Viral
- Drug Storage
- Female
- Hospitalization
- Humans
- Influenza Vaccines/administration & dosage
- Influenza Vaccines/adverse effects
- Influenza, Human/drug therapy
- Influenza, Human/epidemiology
- Influenza, Human/mortality
- Influenza, Human/prevention & control
- Mass Vaccination
- Risk Factors
- United States/epidemiology
- Vaccines, Attenuated/administration & dosage
- Vaccines, Attenuated/adverse effects
- Vaccines, Inactivated/administration & dosage
- Vaccines, Inactivated/adverse effects
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