West Nile Virus Found in Significant Portion of Salt Lake City Mosquitoes

Salt Lake City, UT, August 12, 2026 —

West Nile Virus (WNV) has been detected in a significant portion of mosquitoes sampled within the Salt Lake City district, according to recent findings. Approximately one-third of the sampled mosquito population tested positive for the virus.

The presence of West Nile Virus in such a substantial fraction of the mosquito population raises public health awareness. West Nile Virus is primarily transmitted to humans through the bite of an infected mosquito. While many people infected with West Nile Virus experience no symptoms or only mild ones, a small percentage can develop severe illness.

Severe symptoms can include high fever, neck stiffness, disorientation, coma, tremors, convulsions, muscle weakness, vision loss, and paralysis. These symptoms typically appear within 3 to 15 days after the mosquito bite. In rare cases, the illness can be fatal. Individuals over the age of 50 and those with compromised immune systems are at a higher risk of developing severe illness.

The Salt Lake City district’s public health officials have not yet released specific details regarding the total number of mosquito samples collected or the precise geographical areas within the district where the positive samples were identified. Further information on containment and public advisory measures is anticipated.

Residents are advised to take precautions to prevent mosquito bites. These measures include using insect repellent containing DEET, picaridin, or oil of lemon eucalyptus when outdoors, wearing long-sleeved shirts and long pants, and ensuring that window and door screens are in good repair to prevent mosquitoes from entering homes. Additionally, eliminating standing water around homes, such as in bird baths, clogged gutters, and unused flower pots, can help reduce mosquito breeding grounds.

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