Porcine Epidemic Diarrhea virus is raging across Southeastern Manitoba, showing up 54 premises this winter.
Meanwhile Swine Health Ontario reports only one case since the end of November.
The outbreaks in Manitoba have hit between 65,000 and 70,000 sows since the first case about three months ago.
Officials with Manitoba Pork said it may take some time to stop the spread of the virus which is deadly for the youngest pigs