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The 2026 Tick Season: Essential Information
Warmer weather in spring and summer drives people outdoors, raising the chances of contact with ticks carrying harmful pathogens. The 2026 tick season has started with significant force.
CDC Alert and Emergency Department Data
The CDC recently issued an alert that tick bite emergency room visits have reached their peak level since 2017, indicating a potentially severe season for Lyme disease and related tick-borne conditions.
Emergency room visits related to tick bites have jumped to 71 per 100,000 individuals, over twice the typical rate of approximately 30 per 100,000 during this period.
Information through April 12 reveals the Northeast recording the highest per capita rate, with 163 tick-related emergency visits per 100,000 people, climbing from only 52 in March. This figure already surpasses recent annual peaks in the area, which varied from 74 to 89 per 100,000 between 2021 and 2025.
Lyme Disease Case Statistics
State health agencies documented over 89,000 Lyme disease cases in 2023, the most recent year with full data, though public health specialists estimate roughly 500,000 Americans contract Lyme disease annually.
Identifying Lyme disease is challenging because individuals frequently don’t notice tick bites and may miss early infection indicators. Without treatment, the illness can result in serious lasting, occasionally permanent, health complications.
The CDC warned that emergency department visits due to tick bites are at their highest level since 2017 (stock image)
Understanding Lyme Disease
What Causes Lyme Disease
Lyme disease, named after the Connecticut community where it was initially identified in 1975, results from bacteria in the Borrelia genus, primarily the species Borrelia burgdorferi.
Deer ticks, alternatively known as black-legged ticks from the Ixodes genus, spread the disease after feeding on infected animals, typically birds, mice, or deer. When these ticks subsequently bite humans, they can introduce the bacteria into the bloodstream. Typically, the tick needs to remain attached for 24 to 48 hours to successfully transmit Lyme disease bacteria.
Geographic Distribution and Seasonal Patterns
Lyme disease can develop wherever deer ticks exist. Approximately 90 percent of US cases originate from states in the Northeast, mid-Atlantic area stretching from Virginia to eastern Canada, and Upper Midwest locations such as Wisconsin, Michigan, and Minnesota. Isolated cases emerge in California, Oregon, and Washington.
These ticks are most prevalent during late spring, summer, and fall, typically April through November in most areas. They become active when temperatures rise above freezing. In years with milder winters, ticks can surface earlier and may remain active throughout the year in locations where freezing temperatures are uncommon.
Why Cases Are Rising
Since 1995, Lyme disease cases in the US have roughly doubled. Higher temperatures and shifting precipitation patterns now enable ticks to survive in regions they previously couldn’t colonize, and for extended periods.
Yet, even in areas where ticks were already present, Lyme disease has grown more prevalent due to expanding deer populations. As forested regions experience increased development, deer and mouse habitats may be moving closer to residential areas, elevating transmission risk.
Recognizing and Treating Lyme Disease
Early Symptoms to Watch For
Early Lyme disease indicators, including fever, muscle pain, and fatigue, typically appear within three to 30 days following a tick bite. Another distinctive symptom during the initial month is a target or bull’s eye rash at the bite location, which develops in roughly 70 percent to 80 percent of cases.
Additional rashes after tick bites can also develop. Some may result from bite irritation rather than actual infection.
The longer a tick stays attached to you, the higher your risk of illness. Remove it immediately with tweezers, grasping close to the skin (stock image)
When to Seek Medical Care
If you’re aware you’ve been bitten by a tick and develop flu-like symptoms, or if you observe a bull’s-eye rash regardless of whether you recall a bite, reaching out to your doctor about potential antibiotic treatment is essential.
Blood tests for antibodies can assist in confirming the infection, though they may produce false negative outcomes, especially during the initial weeks of illness.
Treatment Options
In most individuals, the rash resolves independently. Nevertheless, treatment may reduce its duration and is vital for preventing additional symptoms. A two- to four-week antibiotic course typically treats Lyme disease effectively. Severe cases may necessitate intravenous antibiotics.
A new Lyme disease vaccine is presently undergoing testing. In March 2026, Pfizer, the pharmaceutical company creating it, revealed that in a late-stage trial, the vaccine prevented disease in 70 percent of subjects.
Long-Term Complications of Untreated Lyme Disease
Systemic Effects
When not treated, Lyme-causing bacteria can disseminate throughout the body, potentially triggering longer-term symptoms. Approximately 60 percent of untreated Lyme disease patients may experience arthritis. In uncommon cases, Lyme disease can also impact the heart and nervous system.
Neurological Complications
Inflammation of the brain or surrounding tissues, called meninges, can produce headaches and neck pain, alongside balance problems and memory and behavioral alterations. It can also result in nerve damage causing numbness, tingling, and muscle weakness.
These symptoms can manifest immediately or much later, sometimes months to years following infection. In situations where the disease wasn’t quickly treated, late-stage symptoms can persist even after antibiotics eliminate the bacteria.
Post-Treatment Symptom Persistence
Scientists haven’t completely understood why symptoms continue after treatment, but one study discovered that certain fragments from the bacterial cell wall penetrate the joints and can remain after treatment, causing continued inflammation and arthritis symptoms.
Another explanation for Lyme’s long-term effects is its capacity to activate autoimmune disease, where the immune system incorrectly attacks the body’s own cells. Additionally, because the nervous system may be particularly vulnerable to bacterial damage and associated inflammation, recovery may require exceptionally long durations. In some instances, the damage might be permanent.
Prevention Strategies
Until a vaccine becomes available, multiple measures can help protect you and your family from Lyme disease.
Use Tick Repellents
Apply tick and insect repellents such as DEET and picaridin, which are applied to skin, and permethrin, which is used on clothing, to repel ticks. Treating clothing with permethrin may be particularly effective, as the chemical remains active through multiple washes.
Wear Protective Clothing
Wear long-sleeve shirts and pants when gardening, hiking, or walking through grass or wooded regions to prevent tick bites. Selecting light-colored clothing helps ticks become visible, and tucking pants into socks can also prevent ticks from crawling from pants, shoes, and socks onto legs.
Post-Outdoor Precautions
Remove outdoor clothing immediately. Washing and drying clothes at high temperatures can help eliminate any ticks on fabrics, and a prompt shower right after outdoor activities can wash ticks off skin before they attach.
Conduct Daily Tick Checks
If you’ve been outdoors, conduct daily tick inspections, focusing on warm areas like armpits, neck, ears, and underwear line. If you locate an attached tick, extract it with tweezers, holding them perpendicular to the skin.
If you find a tick that may have been attached for over 36 hours, contact your doctor about whether a preventive antibiotic dose, typically administered within 72 hours of the bite, would be advisable.
This article is adapted from The Conversation, a nonprofit news organization dedicated to sharing the knowledge of experts. It was written by Lakshmi Chauhan, associate professor of infectious disease medicine at the University of Colorado Anschutz, and edited by Alexa Lardieri, the US health editor at Daily Mail.
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