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To date no cases of Zika in the state have been linked with local mosquito or human transmission. In 2017, Ada County's first positive West Nile test pool was reported in mid-July.

The two cases are in Musselshell County and Lake County, according to a press release from the agency. Mosquitoes can become infected when they feed on the blood from infected birds.

Mosquitoes acquire the virus by biting infected birds and transmit the virus to people through a subsequent bite.

The mosquitoes that can spread WNV are called Culex quinquefasciatus or the "Southern House" mosquito and can grow to adults in as few as 7 days.

Also, if you have areas on your property where standing water is an issue, you may treat standing water around homes with larvicide briquettes that can be purchased at some retailers. Remove trash and clutter, including discarded waste tires, buckets, tarps and any other items that could collect water.

"Anything ... around your yard that is just a source of standing water that's not moving and isn't chlorinated like your pool is, you want to get rid of that water so you don't encourage mosquito breeding", Rigler said.

DEET-Apply repellent containing an EPA-registered active ingredient, such as DEET, and follow the directions on the package.

For most mosquitoes in the USA, activity peaks during the dusk hours.

Most people are infected in OH by the northern house mosquito, Culex pipiens. In Ohio, West Nile virus was first identified in birds and mosquitoes in 2001. Even though 80% of the West Nile infected people do not report of any symptoms, the ones who experience flu-like symptoms must look for medical attention as soon as possible.

The disease, which has infected more than 150 people in the past six years, is on track to pose an unusually higher-than-normal risk this year and is widespread throughout the commonwealth, having already been found in 51 Pennsylvania counties as of August 1, including Dauphin. About 1 in 5 people who are infected will develop a fever with other symptoms such as a headache, body aches, joint pains, vomiting, diarrhea, or rash. The severe symptoms may last several weeks, and neurologic effects may be permanent.

In less than one percent of people, the virus causes aseptic meningitis or encephalitis which require hospitalization.

West Nile virus infection can only be diagnosed by a health care provider.