Mosquitoes collected from Wauwatosa have recently tested positive for West Nile Virus (WNV). The Wauwatosa Health Department reminds the community to protect themselves from mosquito bites. These are the first mosquitoes from Wauwatosa to test positive since surveillance began in mid-June. Currently, no human cases of WNV illness have been reported in Wisconsin in 2026, but WNV infections have been detected in birds and mosquitoes elsewhere in the state.
WNV is spread to humans and other animals through the bite of an infected mosquito. Mosquitoes acquire WNV by feeding on infected birds. The virus is not spread directly from person to person, animal to animal, or animal to person.
Most people with WNV do not have symptoms. Some people may experience mild symptoms such as fever, chills, headache, muscle ache, rash, and fatigue. Severe symptoms may include high fever, muscle weakness, stiff neck, disorientation, mental confusion, tremors, paralysis, and coma.
Older adults and those with compromised immune systems are at greater risk of developing severe illness. If you suspect WNV, contact a healthcare provider.
WNV cases in humans have been reported from June through November, with most illnesses reported in August and September.
Tips & Prevention
The best way to avoid illnesses spread by mosquitoes is to reduce your exposure to mosquitoes and eliminate mosquito breeding sites. The Wauwatosa Health Department offers these tips to protect yourself and your family:
How to Avoid Mosquito Bites
Apply an insect repellent with DEET, picaridin, oil of lemon eucalyptus, or IR3535 to exposed skin and clothing.
Before heading outdoors, treat clothing with permethrin. Do not apply permethrin directly to skin.
Consider rescheduling outdoor activities that occur during evening or early morning hours, when mosquitoes that spread WNV are most active.
Wear loose-fitting clothing, such as long sleeves, long pants, and socks when outdoors.
Mosquito-Proof Your Home
Remove water from items around your property.
Empty standing water from tin cans, plastic containers, flower pots, discarded tires, roof gutters, and downspouts.
Turn over wheelbarrows, kiddie pools, buckets, and small boats when not in use.
Change the water in bird baths and pet dishes at least every three days.
Clean and chlorinate swimming pools, outdoor saunas and hot tubs, and drain water from pool covers.
Make sure window and door screens are intact and tightly fitted.
Trim or mow tall grass, weeds, and vines. Mosquitoes rest in these areas during the day.
Questions? Contact the Wauwatosa Health Department at (414) 479-8936 or [email protected].