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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 1

Hemagglutination-inhibition titers of control sera to reference virus strains used in this study

Reference influenza A viruses
Control serum 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)
Sheep anti-human H1N1a 640 10 5 5
Sheep anti-human H3N2b 5 320 5 5
Ferret anti-A/NEB 5 10 640 320
Ferret anti-swine H1N1c 5 10 320 640
Normal sheep serum 10 10 5 5

aProduced by immunization of sheep with A/Taiwan/1/86 and A/Texas/36/91 (H1N1).
bProduced by immunization of sheep with A/Shangdong/9/93, A/Johannesburg/33/94, and A/Nanchang/933/95 (H3N2).
cProduced by immunization of ferrets against A/Swine/Wisconsin/01/88 (H1N1).

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