date:May 29, 2014
reaks.
But a year after the virus was identified, repeat outbreaks have occurred at farms but not been publicly confirmed before now. These so-called secondary outbreaks are a challenge to efforts to stem the disease, which is almost always fatal to baby piglets.
The U.S. Department of Agriculture is fighting against repeated outbreaks by trying to extend immunity in female hogs through effective vaccines, Chief Veterinary Officer John Clifford told Reuters at the general session of the World