LOS ANGELES (AP) — Officials are warning San Gabriel Valley residents to be wary of mosquitoes after evidence of West Nile virus was found in three suburban cities east of Los Angeles.

The Los Angeles Times reports tests of mosquitoes and chickens in Arcadia, Irwindale and Monterey Park turned up the virus.

Although most West Nile infections result in mild or no symptoms, the disease can sometimes be fatal.

It is transmitted by mosquito bites.

So far this year there have been 46 confirmed cases of West Nile in Los Angeles County. Two were fatal.

Officials with the San Gabriel Valley Mosquito & Vector Control District are urging people to use avoid activity between dawn and dusk.

Those who do go out should use insect repellent and wear long pants and long-sleeved shirts.

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