West Nile virus has now been reported in seven Idaho counties. The mosquito-borne virus has shown up in Adams, Ada, Bingham, Boundary, Canyon, Gem and Payette counties.
The Idaho Department of Health and Welfare says all instances of the virus have been discovered in mosquito pools, no human cases of the disease have been reported.
Last year, West Nile was found in 16 Idaho counties. Forty people were infected with the virus and two Idahoans died. One of the worst West Nile years on record was 2006 when nearly 1,000 Idahoans were infected and 23 people died.