Cited by 1,700Influenza Virus Research StudiesRespiratory viral infections researchCOVID-19 Clinical Research Studies

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Hospitalized patients with 2009 H1N1 influenza in the United States, April-June 2009

Jain, Seema, Kamimoto, Laurie, Bramley, Anna M., Schmitz, Ann M., Benoit, Stephen R., Louie, Janice, Sugerman, David E., Druckenmiller, Jean K., Ritger, Kathleen A., Chugh, Rashmi, Jasuja, Supriya, Deutscher, Meredith, Chen, Sanny, Walker, John D., Duchin, Jeffrey S., Lett, Susan, Soliva, Susan, Wells, Eden V., Swerdlow, David, Uyeki, Timothy M., Fiore, Anthony E., Olsen, Sonja J., Fry, Alicia M., Bridges, Carolyn B., Finelli, Lyn·2009·New England Journal of Medicine

DOI 10.1056/nejmoa0906695

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Abstract

BACKGROUND: During the spring of 2009, a pandemic influenza A (H1N1) virus emerged and spread globally. We describe the clinical characteristics of patients who were hospitalized with 2009 H1N1 influenza in the United States from April 2009 to mid-June 2009. METHODS: Using medical charts, we collected data on 272 patients who were hospitalized for at least 24 hours for influenza-like illness and who tested positive for the 2009 H1N1 virus with the use of a real-time reverse-transcriptase-polymerase-chain-reaction assay. RESULTS: Of the 272 patients we studied, 25% were admitted to an intensive care unit and 7% died. Forty-five percent of the patients were children under the age of 18 years, and 5% were 65 years of age or older. Seventy-three percent of the patients had at least one underlying medical condition; these conditions included asthma; diabetes; heart, lung, and neurologic diseases; and pregnancy. Of the 249 patients who underwent chest radiography on admission, 100 (40%) had findings consistent with pneumonia. Of the 268 patients for whom data were available regarding the use of antiviral drugs, such therapy was initiated in 200 patients (75%) at a median of 3 days after the onset of illness. Data suggest that the use of antiviral drugs was beneficial in hospitalized patients, especially when such therapy was initiated early. CONCLUSIONS: During the evaluation period, 2009 H1N1 influenza caused severe illness requiring hospitalization, including pneumonia and death. Nearly three quarters of the patients had one or more underlying medical conditions. Few severe illnesses were reported among persons 65 years of age or older. Patients seemed to benefit from antiviral therapy.

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Authors: Jain, S., Kamimoto, L., Bramley, A. M., Schmitz, A. M., Benoit, S. R., Louie, J., Sugerman, D. E., Druckenmiller, J. K., Ritger, K. A., Chugh, R., Jasuja, S., Deutscher, M., Chen, S., Walker, J. D., Duchin, J. S., Lett, S., Soliva, S., Wells, E. V., Swerdlow, D., Uyeki, T. M., Fiore, A. E., Olsen, S. J., Fry, A. M., Bridges, C. B., & Finelli, L.
Affiliations: Centers for Disease Control and Prevention (US)
National Center for Immunization and Respiratory Diseases (US)
National Center for Emerging and Zoonotic Infectious Diseases (US)
National Center for Public Health Informatics (US)
California Department of Public Health (US)
Wisconsin Division of Public Health (US)
Chicago Department of Public Health (US)
Dupage County Health Department (US)
Arizona Department of Health Services (US)
Texas Department of State Health Services (US)
Public Health – Seattle & King County (US)
Michigan Department of Health and Human Services (US)
Epidemic Intelligence Service (US)
ORCID: Jain, Seema
Benoit, Stephen R.
Louie, Janice
Sugerman, David E.
Chugh, Rashmi
Jasuja, Supriya
Duchin, Jeffrey S.
Swerdlow, David
Uyeki, Timothy M.
Olsen, Sonja J.
Fry, Alicia M.
Bridges, Carolyn B.
Venue: New England Journal of Medicine
Publisher: Massachusetts Medical Society
Published: 2009-11-12
Volume: 361
Issue: 20
Pages: 1935-1944
ISSN: 0028-4793 (ISSN-L)
1533-4406
DOI: 10.1056/nejmoa0906695
OpenAlex: W2112166111
Cited by: 1,700
References: 29
Citations by year: 2026: 9 · 2025: 20 · 2024: 35 · 2023: 26 · 2022: 37 · 2021: 52 · 2020: 55 · 2019: 43 · 2018: 42 · 2017: 46 · 2016: 51 · 2015: 78 · 2014: 87 · 2013: 137 · 2012: 232
FWCI: 218.87
Type: journal article
Language: en
Open access: closed
Locations: New England Journal of Medicine (publishedVersion)
PubMed (publishedVersion)
Topics: Health Sciences › Medicine › Epidemiology › Influenza Virus Research Studies
Health Sciences › Medicine › Epidemiology › Respiratory viral infections research
Health Sciences › Medicine › Infectious Diseases › COVID-19 Clinical Research Studies
Keywords: 2009 H1N1 influenza, pandemic influenza A, hospitalized patients, clinical features, intensive care unit admission, mortality, pneumonia, underlying disease, antiviral therapy, treatment timing, influenza-like illness
MeSH terms: Adolescent, Adult, Aged, Antiviral Agents, Asthma, Cardiovascular Diseases, Child, Child, Preschool, Female, Hospitalization, Humans, Infant, Influenza, Human, Intensive Care Units, Male, Middle Aged, Pregnancy, Pregnancy Complications, Risk Factors, United States, Comorbidity, Body Mass Index, Treatment Outcome, Hospital Mortality, Reverse Transcriptase Polymerase Chain Reaction, Influenza A Virus, H1N1 Subtype, Young Adult

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Hospitalized patients with 2009 H1N1 influenza in the United States, April-June 2009

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