A red-tailed hawk found in Walworth County on July 13 has tested positive for West Nile virus. This is the first bird that tested positive for West Nile virus in Walworth County since surveillance for the mosquito-transmitted virus began May 1, according to the Walworth County Division of Public Health.
“The positive bird means that residents of Walworth County need to be more vigilant in their personal protective measures to prevent mosquito bites,” said Erica Bergstrom, health officer.
West Nile virus is spread to humans through the bite of an infected mosquito. Mosquitoes acquire the virus by feeding on infected birds.
“Walworth County residents should be aware of West Nile virus and take some simple steps to protect themselves against mosquito bites,” Bergstrom said. “West Nile virus is here to stay, so the best way to avoid the disease is to reduce exposure to and eliminate breeding grounds for mosquitoes.”
Walworth County Health and Human Services recommends the following:
- Limit time spent outside at dawn and dusk when mosquitoes are most active;
- Apply an insect repellant with DEET, IR3535, picaridin or oil of lemon eucalyptus to exposed skin and clothing;
- Make sure window and door screens are in good repair to prevent mosquito entry;
- Prevent mosquitoes from breeding by removing stagnant water from items such as tin cans, plastic containers, flower pots, discarded tires, roof gutters and downspouts;
- Turn over wheelbarrows, wading pools, boats and canoes 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;
- Landscape to prevent water from pooling in low-lying areas and trim tall grass, weeds and vines since mosquitoes use these areas to rest during hot daylight hours.
The majority of people affected by West Nile virus who become ill usually experience mild symptoms such as fever, headache, muscle ache, rash and fatigue. Fewer than 1 percent of people infected with the virus get seriously ill with symptoms that include high fever, muscle weakness, stiff neck, disorientation, mental confusion, tremors, confusion, paralysis and coma.
Eighty percent of people who are infected with West Nile virus do not get sick. Those who do are older adults and those with compromised immune systems who are at greater risk of developing a central nervous system illness that can be fatal.
The Wisconsin Department of Health Services has monitored the spread of West Nile virus since 2001 among wild birds, horses, mosquitoes and people. During 2002, the state documented its first human infections, and 52 cases were reported that year. During 2017, 48 cases of West Nile virus infection were reported among Wisconsin residents. West Nile virus infections in humans have been reported from June through October; however, most reported becoming ill with West Nile virus in August and September.
The Department of Health Services will continue surveillance for West Nile virus until the end of the mosquito season. To report a sick or dead crow, blue jay or raven, call the Dead Bird Reporting Hotline at 1-800-433-1610.
More information can be found at dhs.wisconsin.gov/arboviral/westnilevirus.htm or by contacting Walworth County Division of Public Health at 262-741-3140 or walcoph@co.walworth.wi.us.
