West Nile Virus Detected in Mosquitoes in Arnold and De Soto
Mosquitoes collected in Arnold and De Soto have tested positive for West Nile virus, as reported by the Jefferson County Health Department.
St. Louis, MO, July 28, 2026 —
Mosquitoes collected in two Jefferson County communities have tested positive for West Nile virus, according to a recent announcement by the Jefferson County Health Department.
The positive tests were identified in samples gathered in Arnold and De Soto. West Nile virus is typically transmitted to humans through the bite of an infected mosquito.
While many people infected with West Nile virus do not develop symptoms, a subset can experience more severe illness. Symptoms can include fever, headache, body aches, joint pains, vomiting, diarrhea, or rash. In rare cases, the virus can lead to neurological issues such as encephalitis or meningitis, or even prove fatal.
The Jefferson County Health Department has not provided further details regarding the specific locations within Arnold and De Soto where the positive samples were collected, nor has it released information about the number of mosquito pools that tested positive.
Officials recommend that residents take precautions to prevent mosquito bites, especially during dawn and dusk when mosquitoes are most active. These measures include using insect repellent, wearing long sleeves and pants, and ensuring that windows and doors have screens to keep mosquitoes out of homes.
The health department also advises eliminating standing water around residences, as this is where mosquitoes lay their eggs. Common sources of standing water include bird baths, clogged gutters, old tires, and containers that collect rainwater.
Further information on West Nile virus and prevention tips can be found on the Jefferson County Health Department’s official website or through the Centers for Disease Control and Prevention (CDC).
Story summarized from the original created by Joey Schneider on fox2now.com, see more information here.
