U.S. doctors warn of a potentially bad year for tick-borne diseases – PBS

Exclusive coverage from Lisa Desjardins and the politics team
Thank you. Please check your inbox to confirm.
Mike Stobbe, Associated Press Mike Stobbe, Associated Press
Leave your feedback
NEW YORK (AP) — Tick season seems to be off to a fast start, with an unusually high number of bites already reported across the country.
Some U.S. doctors are worried about the potential for a bad year for tick-borne diseases.
WATCH: Why tick season is worse than usual and how to protect yourself
“If you have a lot of exposures, there will probably be more cases of tick-related infections,” said Dr. Alina Filozov, an infectious disease doctor at Middlesex Hospital in Middletown, Connecticut.
The Centers for Disease Control and Prevention issued an early advisory to the public this week to guard against ticks.
Tick bites typically spike in May, but “the data are telling us now is the time to take action,” said Alison Hinckley, a CDC Lyme disease expert. “Ticks are out and people are getting bitten.”
Current data is very limited, but the early signs are not good.
The CDC’s tracking system shows that weekly rates of ER visits for tick bites are the highest for this time of year since 2017. That’s true in all regions of the country, except the south-central United States.
About 85% of U.S. hospital emergency departments send data to the surveillance system, but it doesn’t capture people who didn’t go to a hospital.
READ MORE: 4 things you should know about ticks and Lyme disease this summer
It will take months for systematic tick sampling by researchers to chart changes in tick populations. And because not every bite results in an infection, it will also take time for medical experts to know whether there’s an actual surge in Lyme disease or other illnesses.
Ticks are small, eight-legged bloodsucking parasites — arachnids, not insects — that feed on animals and sometimes people.
Tick populations vary throughout the year, and their numbers depend on a few factors. Climate change is widely believed to be having an effect: Ticks like warm, humid weather, and more can be seen after a mild winter. The more deer and mice available for them to feed on may also factor.
READ MORE: What to know about alpha-gal syndrome, a red meat allergy caused by tick bites
Some ticks are infected with germs that can cause serious diseases, including Lyme disease, Rocky Mountain spotted fever and alpha-gal syndrome, a red meat allergy. Lyme disease is the most common, with an estimated 476,000 people treated for it each year, according to the CDC. Infections are commonly treated with antibiotics.
So far this year, most ticks seen in the Northeast have been large adult ticks. But in the weeks ahead, juvenile nymphs will become more common. The emergence of nymphs, along with more people spending time outdoors, are among the reasons tick bites tend to be highest in May. Worse, tiny nymphs attached to people are harder to see — and often are there longer — leading to an increased risk of infections, experts say.
Connecticut has a connection to tick-borne disease — Lyme disease is named after a town there. And earlier this month, the Connecticut Agricultural Experiment Station reported that residents were already submitting an average of 30 ticks per day for testing.
State officials also said an unusually high percentage of the submitted ticks — 40% — tested positive for the bacteria that cause Lyme disease.
READ MORE: Why Lyme and other tick-borne diseases are on the rise
Several factors have been helping tick populations expand, including unusually high numbers of mice in the last two years, said Scott Williams, a tick researcher at the Connecticut Agricultural Experiment Station.
All we have so far is an early snapshot, said Megan Linske, a wildlife biologist with the same agency. She expects the problem to continue to worsen, with more ticks spreading over more areas.
Experts advise that if you go outdoors, note any wooded areas and grassy properties that start bleeding into wooded areas. Ticks tend to perch on ankle-level vegetation with their upper legs outstretched, waiting to latch on to an unsuspecting dog or human.
Try to walk in the middle of paths. Wear light-colored clothing treated with the insecticide permethrin. And use Environmental Protection Agency (EPA)-registered insect repellents.
If you do find a tick, remove it immediately. It’s not necessary to go to a doctor unless you think the tick has been on you for days or if you develop a rash or other symptoms, experts said.
Support trusted journalism and civil dialogue.
Left: Blacklegged tick (Ixodes pacificus) on a leaf, carrier of the Lyme disease, 2005. Image courtesy Centers for Disease Control (CDC) / James Gathany, William L. Nicholson. (Photo by Smith Collection/Gado/Getty Images)
By Lee Rafuse Haines, The Conversation
By Ali Rogin, Satvi Sunkara
By Ula Chrobak, Knowable Magazine
By Teresa Carey
Mike Stobbe, Associated Press Mike Stobbe, Associated Press
Support Provided By: Learn more
Subscribe to Here’s the Deal, our politics newsletter for analysis you won’t find anywhere else.
Thank you. Please check your inbox to confirm.
© 1996 – 2026 NewsHour Productions LLC. All Rights Reserved.
PBS is a 501(c)(3) not-for-profit organization.
Sections
About
Stay Connected
Subscribe to Here’s the Deal with Lisa Desjardins
Thank you. Please check your inbox to confirm.
Support for News Hour Provided By

source