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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.

“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.”

ER visits for tick bites are running high

Current data is very limited, but the early signs are not good.

 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.

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 cause disease, including a meat allergy

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.

Some ticks are infected with germs that can cause serious diseases, including 

, a red meat allergy. Lyme disease is the most common, with an 

 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.

A notorious hot spot is seeing a tick surge

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.

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.

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Tick season seems to be off to a fast start, with an unusually high number of bites already reported across the country. Som

Tick season seems to be off to a fast start, and some experts worry about future illnesses

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