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Bulletin No. 20 - Winter 2004
VirologySwine Influenza
WESLEY RD
Exposure of sero-positive gilts to swine influenza virus may cause a few stillbirths per litter.
Canadian Journal of Veterinary Research, 2004, Volume 68, Nº3, 215-217
Six naturally infected, pregnant gilts, seropositive for swine influenza virus subtype H3N2 were used in this study. Three of them were intranasally exposed to the same subtype at 80-82 days of gestation while the other three were kept as control. Gilts exposed a second time to H3N2 had 2 or 3 stillborn piglets per litter which meant a significantly higher percentage of stillbirths than the control gilts in which no stillbirth was reported. However, there was no evidence that the H3N2 virus had crossed the placenta. The exposition to the virus was the only factor of variation between exposed and non-exposed gilts suggesting that swine influenza virus was in some way the cause of the stillbirths in exposed gilts.
