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H1N1 hemagglutinin-inhibition seroprevalence in Emergency Department Health Care workers after the first wave of the 2009 influenza pandemic. Pediatr Emerg Care 2011 Sep;27(9):804-7

Date

09/01/2011

Pubmed ID

21878831

DOI

10.1097/PEC.0b013e31822c125e

Scopus ID

2-s2.0-80052967973   7 Citations

Abstract

STUDY OBJECTIVE: The 2009 H1N1 pandemic (H1N1pdm) virus has been associated with high rates of asymptomatic infections. Existing influenza infection control policies do not address potential transmission through exposure to asymptomatic infected individuals in health care settings. We conducted a seroprevalence study of H1N1pdm infection to determine whether health care workers (HCWs) in the emergency department showed increased evidence of infection during the first wave of the pandemic than that previously reported in adults in the community.

METHODS: Blood samples and demographic and clinical data were collected from eligible emergency department HCWs. Subjects' sera were tested for presence of antibodies specific for seasonal H1N1 and H1N1pdm viruses by hemagglutination-inhibition assay.

RESULTS: One hundred eight subjects were enrolled, of which 20 (18.5%) were seropositive for H1N1pdm and 52 (48%) for seasonal H1N1. The median age of H1N1pdm-seropositive subjects was 32 years (range, 24-59 years). Of H1N1pdm-seropositive subjects, 35% were asymptomatic. Rates of H1N1pdm detection in HCWs (18.5%) were significantly higher than those observed previously in an identical age cohort in the community (2.6%, n = 262).

CONCLUSIONS: The higher serodetection rates in adults observed in the current study suggest potentially significantly more frequent infections in HCWs than in the general population. Further investigations are needed to ascertain the relative incidence of influenza infections in HCWs and non-HCWs, to study influenza transmission by asymptomatic infected subjects and ascertain the burden of such transmission in health care settings.

Author List

Kumar S, Fan J, Melzer-Lange M, Trost J, Havens PL, Willoughby RE, Chusid MJ, Henrickson KJ

Authors

Michael J. Chusid MD Professor in the Pediatrics department at Medical College of Wisconsin
Peter L. Havens MD Professor in the Pediatrics department at Medical College of Wisconsin
Kelly J. Henrickson MD Professor in the Pediatrics department at Medical College of Wisconsin
Marlene D. Melzer-Lange MD Professor in the Pediatrics department at Medical College of Wisconsin
Rodney E. Willoughby MD Professor in the Pediatrics department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Adolescent
Adult
Aged
Antibodies, Viral
Antigens, Viral
Asymptomatic Diseases
Cross Infection
Emergency Service, Hospital
Environmental Exposure
Female
Hemagglutinin Glycoproteins, Influenza Virus
Hospitals, Pediatric
Hospitals, Private
Humans
Infectious Disease Transmission, Patient-to-Professional
Influenza A Virus, H1N1 Subtype
Influenza Vaccines
Influenza, Human
Male
Middle Aged
Occupational Diseases
Pandemics
Personnel, Hospital
Seroepidemiologic Studies
Wisconsin
Young Adult
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