A mosquito sample from Potter Township has tested positive for the West Nile virus.

It is the fourth positive mosquito sample found so far this year in Centre County. The others were found in Snow Shoe Township and Benner Township in May and Gregg Township on June 20.

Centre County is one of 26 in Pennsylvania where the West Nile virus has been found so far this year.

Of 116 mosquito samples tested here, four have been positive.

Bert Lavan, of the county Planning and Community Development Office, which oversees the county’s West Nile program, urged residents to take precautions against the spread of West Nile by eliminating pools of standing water — such as bird baths — where mosquitoes breed.

Other precautions include using insect repellent, and repairing any holes in screens to keep mosquitoes from coming indoors.