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Volume 8, Number 8—August 2002
Research

Serologic Evidence of H1 Swine Influenza Virus Infection in Swine Farm Residents and Employees

Christopher W. Olsen*Comments to Author , Lynnette Brammer†, Bernard C. Easterday*, Nancy Arden†‡, Ermias D. Belay†, Inger Baker†, and Nancy J. Cox†
Author affiliations: *University of Wisconsin-Madison, Madison, Wisconsin, USA; †Centers for Disease Control and Prevention, Atlanta, Georgia, USA; ‡College of Medicine, Texas A & M University, College Station, Texas, USA;

Main Article

Table 3

Variables associated with seropositivity to swine influenza viruses among the farm participants and the statistical strength of these associations a

Variable HI titer >40b HI titer >80b
Being a farm owner p=0.04 p=0.02
Being a farm owner or the family member of a farm owner p=0.03 p=0.02
Living on a swine farm (p = 0.07) p=0.04
Going into a swine barn >4 days/week (p = 0.12) p=0.04
Age >50 yrs p=0.02 p=0.03
Having received the swine flu vaccine in 1976–77 p=0.02 (p = 0.44)
Ever having received any influenza virus vaccine p=0.03 (p = 0.19)

aP values determined by chi-square or two-sided Fisher’s exact analyses; p values >0.05 cut-off for significance are shown in parentheses.
bTo either swine virus. Abbreviation used: HI, hemagglutination-inhibition.

Main Article

Page created: July 16, 2010
Page updated: July 16, 2010
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The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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