West Bridgewater is one of four Plymouth County towns where the West Nile virus has been detected in a mosquito. In a July 22 testing of mosquito pools, the Massachusetts Department of Public Health found one sample each of the virus in mosquitoes from Abington, Rockland, West Bridgewater, and Whitman. So far this season, no animals or humans have tested positive for the West Nile virus or Eastern equine encephalitis, another disease carried by mosquitoes. Darlene Green, secretary to the West Bridgewater Board of Health, said the board monitors the risk from virus-carrying mosquitoes. “If there is something the board thinks the public needs to know, we put it on our website and publicize it any way we can, including cable TV,” she said. Residents can also request spraying of their yards by calling the Mosquito Control Project at 781-585-5450.