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Pandemic 2009 Influenza A (H1N1) Virus among Japanese Healthcare Workers: Seroprevalence and Risk Factors

Published online by Cambridge University Press:  02 January 2015

Yoko Nukui ,
Shuji Hatakeyama ,
Takatoshi Kitazawa ,
Tamami Mahira ,
Yoshizumi Shintani  and
Kyoji Moriya
Yoko Nukui
Affiliation:
Department of Infection Control and Prevention, University of Tokyo Hospital, Tokyo, Japan
Shuji Hatakeyama
Affiliation:
Department of Infectious Diseases, University of Tokyo Hospital, Tokyo, Japan
Takatoshi Kitazawa
Affiliation:
Department of Infection Control and Prevention, University of Tokyo Hospital, Tokyo, Japan
Tamami Mahira
Affiliation:
Department of Nursing, University of Tokyo Hospital, Tokyo, Japan
Yoshizumi Shintani
Affiliation:
Department of Infection Control and Prevention, University of Tokyo Hospital, Tokyo, Japan
Kyoji Moriya*
Affiliation:
Department of Infection Control and Prevention, University of Tokyo Hospital, Tokyo, Japan
*
Department of Infection Control and Prevention, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8655, Japan (moriya-tky@umin.ac.jp)
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Abstract

Objective.

To evaluate the seroprevalence and risk factors for 2009 influenza A (H1N1) virus infection among healthcare personnel.

Design.

Observational cross-sectional study.

Patients and Setting.

Healthcare workers (HCWs) in an acute care hospital.

Methods.

Between September 14 and October 4, 2009, before 2009 H1N1 vaccination, we collected serological samples from 461 healthy HCWs. Hemagglutination-inhibition antibody assays were conducted. To evaluate the risk factors of seropositivity for 2009 H1N1 virus, gender, age, profession, work department, usage of personal protective equipment, and seasonal influenza vaccination status data were gathered via questionnaires.

Results.

Our survey showed that doctors and nurses were at highest risk of seropositivity for the 2009 H1N1 virus (odds ratio [OR], 5.25 [95% confidence interval {CI}, 1.21–22.7]). An increased risk of seropositivity was observed among pediatric, emergency room, and internal medicine staff (adjusted OR, 1.98 [95% CI, 1.07–3.65]). Risk was also higher among HCWs who had high titers of antibodies against the seasonal H1N1 virus (adjusted OR, 1.59 [95% CI, 1.02–2.48]).

Conclusions.

Seropositivity for the 2009 H1N1 virus was associated with occupational risk factors among HCWs.

Infect Control Hosp Epidemiol 2012;33(1):58-62

Type
Original Articles
Information
Infection Control & Hospital Epidemiology , Volume 33 , Issue 1 , January 2012 , pp. 58 - 62
Copyright
Copyright © The Society for Healthcare Epidemiology of America 2012

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