Lyme disease and ticks that carry it spread across the US

Lyme disease is one of the most prevalent insect-borne diseases in the country, with far more cases each year than other diseases carried by mosquitoes, fleas and ticks, such as the West Nile virus.

The U.S. Centers for Disease Control and Prevention’s most recent Lyme disease data is from 2022. That year, there were more than 62,000 reported cases of the tick-borne disease, but the CDC estimates that because of underreporting, the true number of cases each year could be seven times that number.

The prevalence of the disease, which is spread to people through the bite of a blacklegged tick, or a deer tick, has increased dramatically since the U.S. first began tracking the disease in 1991. While better surveillance explains part of the increase, warming climate has also made more of the country suitable for the ticks that carry the disease.

When treated early, Lyme disease symptoms can go away entirely. However, if it is not treated early, the disease can be chronic, with symptoms such as arthritis, fatigue and persistent body aches.

While Lyme disease is most prevalent in the northeastern United States, as deer ticks have spread, so has the disease. In 2022, Vermont had one of the highest numbers of cases per capita with nearly 200 cases per 100,000 people. In 1996, Vermont had only one case per 100,000 people.

How to avoid tick bites

Ticks in general are still a big problem and they can cause other health issues. This summer, the rate of emergency department visits for ticks in the Midwest was at an all-time high.

The CDC advises that people wear long pants and shirts when in tick-infested areas, such as wooded areas or areas with tall grass, and to tuck pants into socks to create a barrier.

The agency advises checking sensitive areas such as armpits and behind the ears after spending time outside in one of these areas.

Lyme disease can be identified by a red, circular rash that appears at the site of a tick bite three to 30 days after being bitten. The agency advises going to a health care provider immediately as soon as this type of rash is visible.

Lyme disease is most commonly reported in the spring, summer and fall, but ticks can be active any time the temperature is above freezing.

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