STAR (KTVB) -- A mosquito trap in northwest Ada County near Star tested positive this week, according to the Ada County Weed, Pest & Mosquito Abatement Department.

This trap is located in an area between Highway 16 and North Star Road, north of Highway 44. This is the first appearance of West Nile Virus in Ada County so far this year.

The virus has not been found in other nearby traps.

After fogging in the area this week, a retest in the same trap location showed no West Nile Virus.

The Gem County Abatement District detected mosquitoes infected with West Nile last week.