Montgomery County officials announced that positive tests for the West Nile virus have been found in mosquitoes.
The tests came back positive from Shenandoah and south Montgomery County.
Officials are urging the community to avoid being outdoors from dusk to dawn, to wear long-sleeved clothing, and to use a mosquito repellant that contains DEET.
There have been two confirmed human cases of West Nile in Harris County this year. The first was a woman between the ages of 55-74 with a possible pre-existing health condition in northeast Houston. The second case was a male between the ages of 16-24 in northwest Harris County.
Symptoms of West Nile virus include fever, head ache, fatigue, body aches, swollen lymph glands and skin rash.