Tick-borne illnesses are on the rise across the United States, prompting a reexamination of how to manage these disease vectors. In April, emergency room visits nationwide related to tick bites increased by 52% compared to the previous year, with a further rise in May, according to CDC data. This spring saw the highest early-season numbers recorded since 2017.
New York is experiencing a significant increase in Lyme disease cases, averaging over 17,500 annually in recent years, with preliminary 2025 figures showing a 15% jump from the prior year. While California has lower Lyme infection rates, the western blacklegged tick, a primary carrier, has been detected in 56 of the state's 58 counties. In San Mateo County, approximately one in 20 young western blacklegged ticks tested in 2024 and 2025 carried the bacteria responsible for Lyme disease.
Beyond Lyme, ticks transmit a range of other diseases and health concerns. New York recently confirmed its first human case of Bourbon virus on Long Island, a rare and potentially fatal infection spread by the lone-star tick, for which there is no vaccine or specific treatment. Other tick-borne ailments include babesiosis, anaplasmosis, ehrlichiosis, Rocky Mountain spotted fever, Powassan virus, and a specific red meat allergy.
This escalating health threat has led to questions about the necessity of ticks in the environment and the feasibility of their eradication. Sam Telford III, a professor and epidemiologist at Tufts University's Cummings School of Veterinary Medicine, stated that "there is no obvious ‘need’ for or ‘benefit’ of ticks in the environment," noting that healthy ecosystems exist in areas without ticks.
Joanna Buchthal, a postdoctoral associate at the MIT Media Lab, echoed this sentiment, suggesting that "if that same God decided to vacuum up every tick on Earth, there would be effectively zero environmental consequence." Richard S. Ostfeld, a disease ecologist at the Cary Institute of Ecosystem Studies, concurs, surmising that eliminating key tick species like the blacklegged and lone-star ticks would likely have no detectable impact on other organisms.
While some creatures, such as ants, spiders, beetles, and birds, do consume ticks, most have alternative food sources. Ostfeld pointed out that ticks are more of an "occasional snack" for many animals in New York, unlike African oxpeckers, which rely on them more heavily. A unique interaction in California involves the western fence lizard, whose blood can kill the Lyme bacteria within a feeding tick, potentially aiding the larger tick population's survival.
Efforts to combat ticks are complicated by the methods used. Current acaricides and insecticides are broad-spectrum, posing risks to pollinators like butterflies and bees, as well as other wildlife, pets, and humans. For instance, blanketing Long Island with a common pesticide would require millions of gallons, a prospect deemed scientifically irresponsible and financially infeasible by Ostfeld.
Historical precedent exists for tick eradication. In the early 20th century, federal inspectors successfully eliminated cattle-fever ticks from most of the U.S. by 1943 through quarantines and treatments. However, these ticks spent all parasitic life stages on a single host, making them easier to target. Blacklegged and lone-star ticks, by contrast, feed on diverse hosts and habitats, complicating eradication efforts.
Telford identified biological factors, diverse animal and habitat interactions, dense human populations, and a lack of economic incentives as primary obstacles. Eliminating ticks from densely populated areas like Long Island, with its extensive human settlement and wildlife movement, presents unique challenges. A strategy might involve targeting ticks near homes and then expanding to parks and natural reservoirs, though birds can continue to reintroduce them.
Innovative strategies are being explored. Researchers at MIT are developing genetically engineered mice that are immune to Lyme disease, aiming to pass this immunity to their offspring. This approach could potentially be extended to other tick-borne illnesses by engineering mice whose blood interferes with feeding ticks.
Another avenue involves altering ticks themselves so that future generations carry a trait that reduces the wild population. However, releasing millions of engineered ticks to achieve this is a significant hurdle, as public acceptance and long-term presence are concerns. Furthermore, ticks' slow reproduction rate means that gene drive suppression would take decades to show significant effects, even with extensive initial releases.
Telford suggested that a comprehensive "Manhattan Project" against ticks, backed by substantial funding, would need to combine all available weapons and anticipate legal challenges from animal rights and environmental groups, as well as property owners.
The complexity of tick-borne diseases and the difficulties in controlling tick populations underscore the need for a multifaceted approach. The current situation highlights the ongoing challenge of managing these parasites without causing collateral environmental damage, a problem that has been decades in the making and will require sustained effort to become more manageable.