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Volume 8, Number 8—August 2002


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;

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Table 2

Geometric mean titers of preseason serum samples from farm participants and urban control serum samples

Reference influenza A viruses
Participants A/Johannesburg/82/96 (A/JOH)
(human H1N1 virus) A/Nanchang/933/95
(human H3N2 virus) A/Nebraska/01/92
(zoonotic swine H1N1 virus) A/Swine/Indiana/1726/88
(swine H1N1 virus)
Farm participants 15.3 8.6 13.2a 15.7a
Urban control participants 14.2 8.0 5.1 5.4

ap>0.0001 (Wilcoxon rank sum analysis with normal approximation).

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