MILWAUKEE -- The first bird and horse have tested positive for West Nile virus in Wisconsin.

State and county health officials said a bird in Eau Claire County and a horse in Chippewa County tested positive for the virus.

The cases are the first positive tests for the entire state so far this year.

Health experts said that very few mosquitoes actually carry the virus but that the bird and animal cases are important as an early-warning system for humans.

State health officials are urging people to take extra precautions against mosquito bites.

According to doctors, the disease spreads when the insects feed on infected birds and then feed on humans.

State workers started engaging in surveillance activities as of May 1.

Anyone who finds a dead bird in their year or has a question about a dead bird is asked to call the Dead Bird Reporting Hotline at 1-800-433-1610.

Horse owners should contact their veterinarian if they suspect that their horse is ill with West Nile virus infection.

Prevention Tips

Here are some steps that people can take to decrease their exposure chances.

• Limit time spent outside at dawn and dusk, when mosquitoes are most active.
• Apply insect repellant to clothing as well as exposed skin since mosquitoes may bite through clothing.
• Make sure window and door screens are in good repair to prevent mosquito entry.
• Properly dispose of items that hold water such as tin cans, plastic containers, ceramic pots or discarded tires.
• Change the water in birdbaths and pet dishes at least every three days.
• Clean and chlorinate swimming pools, outdoor saunas and hot tubs; drain water from pool covers.
• Trim tall grass, weeds and vines since mosquitoes use these areas to rest during hot daylight hours.

Doctors said that people who contract the virus may not show any symptoms for three to 15 days after infection.

People who do become ill typically develop a fever, headache and rash that lasts a few days.

Any person who thinks they may have contracted a West Nile virus infection should contact their doctor or a hospital.