Mosquitoes trapped in Cromwell Aug. 6 have tested positive for West Nile virus, the Connecticut Agricultural Experiment Station reported Tuesday.

"Mosquito populations are high and we expect to continue to identify West Nile virus-infected mosquitoes," Theodore Andreadis, chief medical entomologist at the experiment station, said. "Connecticut residents should take announcements seriously and take precautions to avoid mosquito bites."

Thus far this year, West Nile-positive mosquitoes have been trapped in four towns - Darien, Cromwell, Greenwich and Stratford. No Connecticut residents have been identified with WNV infections.

Dr. J. Robert Galvin, state public health commissioner, reminded the public that the risk of mosquito-transmitted diseases like West Nile virus and eastern equine encephalitis virus usually increases through the late summer and early fall.

The agricultural experiement station maintains a network of 91 mosquito-trapping stations in 72 municipalities throughout the state.