Deer ticks cause most of the tickborne disease in Wisconsin.

We monitor illnesses caused by tick bites in Dane County. 


Why are We Concerned About Ticks?

  • There are a number of diseases in Wisconsin that are spread by bites from infected ticks. These diseases are common.
  • Ticks are most active in spring, summer, and early fall. These are the times when people are outside a lot and could be bitten.
  • Wisconsin winters are becoming milder. This creates a longer active tick season and increases your chance of getting a tickborne disease.
  • Not all ticks spread disease and you won't get sick from each tick bite.
  • In Dane County, there have been an average of 109 cases per year. Additionally there are usually 10-15 cases of another tickborne disease, anaplasmosis each year.

How Ticks Spread Disease

Sizes of deer tick nymphs and adults.

  • Most tickborne diseases in Wisconsin are spread by the black-legged tick, also known as the deer tick. Deer ticks are very small—nymphs are the size of a poppy seed and adults are the size of a sesame seed.
  • Ticks feed by biting skin. While they are attached to skin, disease can be spread. Once attached, they usually feed for 3-5 days. Usually it is just nymphs and adult females that spread most tickborne diseases.
  • Ticks live in natural areas with trees, bushes, or high grass. They can't jump or fly. They crawl onto you or your dog when you brush against leaves or grass.

Tickborne Illness and Symptoms

  • Early symptoms of tickborne diseases can happen from three to 30 days after a bite from an infected tick.
  • Lyme disease often, but not always, starts with a rash that looks like a bullseye around or near the tick bite. Not everyone gets that kind of rash, and sometimes don’t even see a tick on their body. If you do see a bullseye rash, call your healthcare provider.
  • Fever, rash, chills, headache, fatigue, muscle or joint aches, or swollen lymph nodes are symptoms of tickborne diseases. If you have spent time outside and have symptoms, talk to your healthcare provider, even if you haven't seen a tick on your body or a rash
  • You should have a complete recovery if you start antibiotics as soon as possible.
  • If tickborne diseases are not treated, they can be serious and sometimes fatal, even in healthy people.

What You Can Do To Prevent Tick Bites

Preventing tick bites is the best way to stay healthy.

  • Avoid areas where high grass, leaves, trees, and other vegetation touches your clothes, and walk in the center of trails.
  • Use EPA registered insect repellents on exposed skin and clothing. Follow instructions carefully.
  • Use products that contain permethrin on clothing, carefully following product instructions.
  • Tuck pant legs into socks, and shirts into pants.
  • Do a tick check of your whole body every day, even if you were only in your backyard.
  • Remove ticks promptly with a tweezer by holding the tweezers close to the ticks head and pulling upward with steady pressure. Ticks can be as small as a poppy seed or sesame seed. It’s important that ticks be removed completely, and as soon as possible.
  • Shower or bathe as soon as possible after you've been outside.
  • Tumble clothing you’ve worn on high heat in a dryer, to kill any ticks on clothing.

Ticks and Pets

Dogs are very susceptible to tick bites and the diseases they cause. Tick prevention products should be used on dogs regularly and tick checks should be done daily. If a tick comes into the house on a dog, it could bite another pet or person living in the house.

Tick bites on dogs can be hard to spot. Look for ticks:

  • In and around ears
  • Around eyelids
  • Under the collar
  • Under the front legs
  • Between toes and the back legs
  • Around the tail

Symptoms of tickborne diseases may take 7 to 21 days to show. Call your vet if your dog has behavior or appetite changes.

Cats are very sensitive to tick prevention products. Talk to your vet before using them.


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