The Fond du Lac County Public Health Officer says the first activity of West Nile virus in Wisconsin is a reminder to take precautions to prevent mosquito bites even as the summer winds down. The state Department of Health Services says a healthy blood donor from Washington County screened positive for West Nile, and a dead bird from Chippewa County tested positive for the virus. Fond du Lac County Public Health Officer Kim Mueller says the risk of West Nile virus continues until the first hard frost. While the virus poses a risk to all Wisconsinites, people who have weakened immune systems are at higher risk for significant illness.
