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MAYVILLE – Mosquitoes carrying West Nile virus and Eastern Equine encephalitis have been found near Jamestown, the Chautauqua County Department of Health and Human Services reports.

The insects were captured for testing July 27 at the Jamestown Audubon Center and Sanctuary on Riverside Road, officials said. The Audubon Society has shortened hours there to avoid exposure at dawn and dusk, when mosquitoes are most active. It also is requiring visitors to wear insect repellent.

Ruth Lundin, Jamestown Audubon Society president, said that mosquitoes are constantly tested at the sanctuary. She pointed out that the risk to visitors is small.

County health officials noted that during the past 12 years there have been 490 cases of West Nile in the state, with 37 deaths, and five human cases of EEE in the past 40 years, all of them fatal.

Last month the Erie County Health Department reported two pools of mosquitoes infected with West Nile virus had been found in Amherst.