St. Louis County Department of Public Health officials confirmed Tuesday there are mosquitoes carrying the West Nile virus in the area.
West Nile virus is spread to humans through the bite of an infected mosquito.
It's the first time a pool of mosquitoes have tested positive this season.
West Nile Virus has shown up earlier this year than in past years.
Late spring rain leaves behind stagnant water that creates the ideal mosquito breeding conditions and the Sacramento-Yolo Mosquito and Vector Control District reminds the public to "drain after the rain" to prevent mosquitoes.
Mosquitoes transmit WNV by feeding on infected birds and transmit the disease when biting another bird, animal or human. The campaign focuses on providing information to pregnant women and their partners who may be considering travel to areas where Zika virus transmission is ongoing. West Nile virus infections in humans have been reported from June through October; however, most reported becoming ill with West Nile virus in August and September. The state has had 51 cases of Zika infection in OR since January 2016.
The Local Flood Disaster Emergency was declared in late March, and will remain in effect until terminated by Ada County commissioners.
This is the first year that OR has had the ability to test the insects, thanks to a grant from the Centers for Disease Control and Prevention. If you have a water source that can not be drained, treat with mosquito dunks or bits that contain Bacillus thuringiensis israelensis (Bti), which kills larvae.
Also, residents should get rid of any sources of standing water on or near their property, including drilling holes in tire swings, and fill in any holes in the yard with dirt.