"Multiple pools" of mosquitoes in Davis County have tested positive for West Nile virus. KUTV. The health department released the findings Tuesday and advised the public to "be careful. " This summer, mosquitoes in Weber County, Washington County and central Utah have all tested positive for the virus. Experts have warned the publicto wear bug repellent with DEET, long sleeved shirts, pants and to remove any standing water near their residences."Multiple pools" of mosquitoes in Davis County have tested positive for West Nile virus. KUTV. The health department released the findings Tuesday and advised the public to "be careful. " This summer, mosquitoes in Weber County, Washington County and central Utah have all tested positive for the virus. Experts have warned the publicto wear bug repellent with DEET, long sleeved shirts, pants and to remove any standing water near their residences. Mosquitoes in Davis County test positive for West Nile virus | KUTV