West Nile virus has now turned up in mosquitoes in Huron County.
The Huron County Health Unit says two samples from mosquito traps around the region tested positive for the virus.
Positive mosquitoes have also been found in neighbouring regions.
Residents are being asked to protect themselves by using approved insect repellent and covering up with light coloured clothing.
You should remove any standing water, and ensure your screens are undamaged.