Sarnia-Lambton has its first positive human case of West Nile virus this year.
A Dawn-Euphemia resident is being treated for the virus. This is the first lab confirmed human case in the area since 2012, according to Lambton Public Health.
Earlier this summer, there were positive mosquito pools located in Wyoming and Petrolia and a bird in Sarnia tested positive for the virus as well.
West Nile can be passed to humans through an infected mosquito.
A very small number of people will get sick but occasionally West Nile virus can cause encephalitis.
Lambton Public Health says the current mosquito season is not over until frost and cold temperatures halt breeding.
Residents are urged to take precautions to prevent exposure to mosquitoes by eliminate breeding sites and standing water and wearing insect repellent containing deet.