First Bourbon Virus Case Confirmed in New York
Health officials and researchers at Stony Brook University have confirmed the first known case of Bourbon virus in New York state, a rare and potentially fatal tick-borne illness with no known cure or vaccine. The patient, a 67-year-old Long Island man, was hospitalized in April 2026 after being bitten by lone star ticks while working outdoors in Suffolk County, but he has since recovered.
The finding, published in the American Journal of Tropical Medicine and Hygiene, analyzed blood samples from 107 New York residents who showed symptoms of tick-borne illness between 2019 and 2024. Among them, two people tested positive for neutralizing antibodies to Bourbon virus, and one patient—the Long Island man—showed an eight-fold rise in antibody levels over a month, confirming an acute infection.
“This one case certainly was the Bourbon virus, and over a one-month period antibody titers increased eight-fold,” said Dr. Luis Marcos, director of the Tick-borne Disease Clinic at Stony Brook and lead author of the study. “The patient had shown some very severe symptoms and was hospitalized.”
Bourbon virus is named after Bourbon County, Kansas, where it was first identified in 2014. That initial patient died 11 days after falling ill. Since then, only a handful of cases have been confirmed, primarily in the Midwest and Southern U.S., with at least two deaths attributed to the virus—one in 2014 and another in 2026.
The New York case marks the first conclusive evidence that the virus is sickening residents in the Northeast, raising concerns among infectious disease experts that the disease is more widespread than previously recognized.
Why This Matters: The Growing Threat of Tick-Borne Diseases
The confirmation of Bourbon virus in New York highlights an alarming trend: the range of the lone star tick (Amblyomma americanum)—the primary vector for the virus—has been expanding northward and westward for decades. Once concentrated in the Southeast and Midwest, these aggressive ticks are now established throughout much of the Northeast, including dense suburban areas of Long Island, Connecticut, and Massachusetts.
“There are a lot of lone star ticks in New York and in the Northeast, we have dense populations, and when someone is infected with Bourbon virus symptoms they are similar to other tick-borne infections,” Marcos said in a university statement. “For these reasons, the Bourbon virus is likely more prevalent than we think in our region and other cases are likely not being diagnosed.”
The Lone Star Tick: A Spreading Menace
The lone star tick is easily recognizable by the distinctive white spot on the back of adult females. Unlike deer ticks, which are associated with Lyme disease, lone star ticks are more aggressive and will bite humans at multiple life stages. Their proliferation is closely tied to the booming white-tailed deer population, which serves as a primary host for adult ticks. As deer have moved into suburban neighborhoods, they’ve brought ticks with them, and warmer winters have extended the tick season.
Lone star ticks are not just carriers of Bourbon virus; they also transmit ehrlichiosis, tularemia, and can trigger alpha-gal syndrome—a potentially life-threatening allergy to red meat and dairy products. The expanding range of these ticks means more people are being exposed to a cocktail of pathogens, many of which are difficult to diagnose.
A Silent Threat: Symptoms Mimic Other Illnesses
Bourbon virus symptoms include fever, fatigue, headache, body aches, nausea, vomiting, and sometimes a rash. These symptoms are nearly identical to those of Lyme disease, ehrlichiosis, and other common tick-borne infections, making clinical diagnosis difficult without specific testing.
In the Long Island case, the patient was initially prescribed antibiotics for presumed Lyme disease, but his condition worsened. He developed a rash, high fever, night sweats, and severe headaches before being hospitalized for five days.
“Now we know the virus can be lethal,” Marcos told CBS News. “On Long Island, at least, we have a lot of lone star ticks. And honestly this may be the very, very tip of the iceberg.”
The lack of a widely available commercial test for Bourbon virus compounds the problem. Doctors often rely on serological testing for neutralizing antibodies, but these tests are not part of standard tick-borne panels. As a result, many infections likely go undetected, with patients recovering—or succumbing—without ever knowing the true cause.
Underdiagnosis and the Need for Vigilance
The Stony Brook study underscores a critical gap in public health surveillance. By testing blood samples from patients with suspected tick-borne illness, researchers found evidence of Bourbon virus in two individuals, suggesting that the infection is circulating in the Northeast more than previously thought.
Dr. Marcos and his colleagues argue that physicians should consider Bourbon virus in patients presenting with fever, fatigue, and low blood cell counts, especially if they have a history of tick exposure and do not respond to standard treatments.
Limited Treatment Options and No Vaccine
Currently, there are no specific antiviral treatments for Bourbon virus and no vaccine to prevent it. Care is largely supportive, focusing on hydration, fever reduction, and management of complications. For severe cases, hospitalization may be required, but the mortality rate among known cases is high—about 30% of the small number of confirmed patients have died.
The economic and social costs of tick-borne diseases are substantial. Lyme disease alone affects an estimated 476,000 Americans each year, and the emergence of new pathogens like Bourbon virus adds another layer of complexity to tick management efforts.
Broader Implications: Climate Change and Tick Expansion
Scientists attribute the northward expansion of lone star ticks to a combination of factors, including climate change, land-use changes, and wildlife population dynamics. Warmer winters allow ticks to survive in areas that were once too cold, while longer autumn and spring seasons extend the period of tick activity.
A 2026 tick survey in Massachusetts showed lone star ticks are now present in all 351 towns in the state, a dramatic increase from just a few decades ago. Similar trends are being observed across New England and the Upper Midwest.
“The reality is that we are seeing new tick species and new tick-borne pathogens move into regions where they were previously unknown,” said Dr. Andrew Handel, a pediatric infectious disease physician at Stony Brook Children’s Hospital, in a Fox Weather interview. “Prevention is key—people need to be aware that ticks are not just a summer nuisance, they are a year-round public health threat.”
The confirmation of Bourbon virus in New York is a wake-up call for public health agencies. It suggests that the Northeast may be on the front line of a broader emergence of diseases previously confined to other regions.
What This Changes for Residents and Doctors
For New Yorkers, the takeaway is clear: tick precautions are no longer optional. Health officials recommend using EPA-registered repellents, performing daily tick checks, and showering within two hours of being outdoors. Landscaping practices that reduce tick habitat—such as keeping grass short and creating barriers between woods and lawns—can also help.
For physicians, the case highlights the importance of considering Bourbon virus in differential diagnoses. The CDC advises that patients with unexplained fever and a history of tick exposure in areas with known lone star ticks should be evaluated for Bourbon virus, even if they test negative for Lyme and other common infections.
The Stony Brook team is now working on developing a more accessible diagnostic test, which could greatly improve surveillance. In the meantime, they recommend that state health departments add Bourbon virus testing to their standard tick-borne panels.
A Connected World: New Diseases Emerge, Preparedness Lags
The emergence of Bourbon virus in New York is part of a broader global pattern. As humans encroach on wildlife habitats and climate change alters ecosystems, pathogens that were once contained in animal reservoirs are spilling over into human populations.
Recent outbreaks of other tick-borne diseases—such as Powassan virus, which has caused fatalities in the Northeast, and the Heartland virus in the Midwest—show that the public health infrastructure is often ill-prepared to identify and respond to emerging threats.
“We are in an era of increasing tick-borne disease complexity,” said Marcos. “The old approach of just testing for Lyme disease is no longer sufficient. We need a comprehensive strategy that includes surveillance, diagnostics, and public education.”
The Bourbon virus case on Long Island may be just one case, but it represents a significant milestone in the understanding of emerging infectious diseases. It also raises urgent questions about how to protect communities as the risk landscape shifts.
For now, residents in the Northeast are advised to remain vigilant, but not panicked. The risk of contracting Bourbon virus remains low, but the consequences are severe enough that precautions are worthwhile.
As Dr. Marcos put it: “The bottom line is that we have a new tick-borne disease in New York, and we need to keep it on our radar.”
For more on tick-borne disease prevention, check out our guide to staying safe during tick season. And for a look at how climate change is affecting other public health threats, read our article on harmful algal blooms.
This article reflects the latest information available as of August 2, 2026. The World Health Organization and CDC continue to monitor Bourbon virus activity.
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