A state veterinarian says several factors have contributed to the lengthy battle against highly pathogenic avian influenza.
Dr. Nora Wineland, with the Michigan Department of Agriculture and Rural Development, says the virus has become endemic in non-migrating birds.
“Prior to this summer and the fact that the virus didn’t disappear, I would have told you that generally, we don’t see as many cases in the summer, but this virus has hung around,” she says.
