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A growing threat across much of the U.S. and Canada

Lyme disease is one of the most common vector-borne illnesses in the United States, with nearly 300,000 cases diagnosed each year. It’s caused by bacteria transmitted through the bite of infected black-legged ticks—also known as deer ticks.

Where Lyme Disease Is Most Common

While Lyme disease is found across the U.S. and parts of Canada, it’s most prevalent in:

  • The Northeast (Virginia to Maine)

  • The Northern Midwest

  • Northern California

About 80% of cases occur from May through July, when tick activity is highest. However, risk persists nearly year-round—especially in wooded or grassy areas where ticks thrive.

Why Prevention Is Urgent

According to the CDC’s Lyme Disease Program, this “tremendous public health problem” demands increased awareness and prevention efforts. Infected ticks are small—about the size of a poppy seed—so bites often go unnoticed.

Without treatment, Lyme disease can cause serious complications, including:

  • Joint pain and swelling

  • Heart and neurological problems

  • Long-term fatigue and cognitive issues

How to Protect Yourself

  • Use EPA-registered insect repellent when hiking, camping, or spending time in grassy/wooded areas

  • Wear long sleeves and pants, and tuck pants into socks

  • Check your body and clothing for ticks after outdoor activity

  • Treat clothing with permethrin for added protection

  • Shower promptly after being outdoors to help remove unattached ticks

  • Inspect pets, as they can carry ticks into the home

Your local health department can tell you if tick precautions are recommended in your area.

More Info for Families

For parents, we recommend KidsTravelDoc.com — a trusted resource from a pediatrician’s perspective covering safe travel and recreation for children.

Lyme disease is preventable. With awareness and the right precautions, you can enjoy the outdoors without unnecessary risk.

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