Volume 8, Number 8—August 2002
Research
Serologic Evidence of H1 Swine Influenza Virus Infection in Swine Farm Residents and Employees
Christopher W. Olsen*
, Lynnette Brammer†, Bernard C. Easterday*, Nancy Arden†‡, Ermias D. Belay†, Inger Baker†, and Nancy J. Cox†
, Lynnette Brammer†, Bernard C. Easterday*, Nancy Arden†‡, Ermias D. Belay†, Inger Baker†, and Nancy J. Cox†
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 (A/NAN) (human H3N2 virus) | A/Nebraska/01/92 (A/NEB) (zoonotic swine H1N1 virus) | A/Swine/Indiana/1726/88 (Sw/IND) (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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