Doctors at a Long Island hospital confirmed New York's first known case of Bourbon virus, a rare, tick-borne infection that has killed at least two people since its discovery in 2014.
A patient treated at Stony Brook Medicine in Suffolk County tested positive for the virus in April 2026 after showing severe symptoms that required hospitalization. Dr. Luis Marcos, who directs the Tick-borne Disease Clinic at Stony Brook and holds professorships in medicine and microbiology at the Renaissance School of Medicine, confirmed the diagnosis through lab work showing the patient's antibody levels jumped eight-fold over a single month.
The patient recovered. But the case marks a troubling first for a state where millions of residents spend warm months outdoors in areas thick with the Lone Star tick, the species responsible for spreading the virus.
Bourbon virus takes its name from Bourbon County, Kansas, where researchers first identified it in 2014. That same year, the virus claimed its first confirmed victim. A second death followed in 2026, Stony Brook Medicine reported in a news release. The circumstances of both deaths, including the victims' identities and locations, remain publicly unclear.
Cases have turned up across the Midwest, Southern states, and the Northeast, according to the Centers for Disease Control and Prevention. Symptoms mirror other tick-borne infections: fever, fatigue, body aches, and other nonspecific complaints that make the virus easy to miss, or misdiagnose entirely.
That overlap is exactly what worries Marcos.
He told Fox Weather:
"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-born infections. For these reasons, the Bourbon virus is likely more prevalent than we think in our region and other cases are likely not being diagnosed."
Put plainly: the virus may already be circulating more widely than case counts suggest, and doctors are not catching it because they are not looking for it.
Marcos and colleagues at Stony Brook published their findings in the American Journal of Tropical Medicine and Hygiene. Their study examined 107 patients who came in between 2019 and 2024 with fever and symptoms consistent with tick-borne illness. The confirmed April 2026 case added a concrete data point to years of clinical observation.
Marcos described the diagnosis in precise terms:
"This one case certainly was the Bourbon virus, and over a one-month period antibody titers increased eight-fold. The patient had shown some very severe symptoms and was hospitalized."
The study's authors did not hold back about what needs to happen next. They called for "expanded viral surveillance, clinical testing and assay development to improve clinical decision-making and inform tick-borne disease epidemiology and vector management." In plain English: better tests, broader screening, and more systematic tracking of what ticks are carrying and where.
That call matters because, right now, no widely available rapid diagnostic test exists for Bourbon virus. Confirming a case required a month of antibody monitoring, a timeline that does little for a patient in acute distress.
The Lone Star tick has expanded its range across the eastern United States over recent decades. New York and the broader Northeast now host large populations of the species, which is aggressive and feeds on humans at every life stage. Marcos pointed to the region's dense human population as a compounding risk factor, more people in tick habitat means more potential exposures and more potential missed diagnoses.
Dr. Andrew Handel, a pediatric infectious disease physician at Stony Brook Children's Hospital, was also referenced in connection with tick safety guidance, though his specific recommendations were not detailed in the available reporting.
A tick survey conducted on May 18, 2026, in Aquinnah, Massachusetts, a small town on Martha's Vineyard, captured images of Lone Star ticks being collected from residential yards, a reminder that these pests are not confined to deep woods or rural backcountry. They are in suburban lawns and coastal communities across the region.
The CDC maintains informational pages on Bourbon virus, listing known symptoms and the geographic areas where cases have appeared. But no new federal surveillance programs, testing mandates, or public health campaigns have been announced in response to the New York case or the 2026 death.
That gap between what researchers are finding and what public health agencies are doing is worth watching. Marcos and his co-authors laid out a clear case that existing diagnostic tools and surveillance networks are not keeping pace with a virus that may be hiding in plain sight behind more familiar tick-borne diagnoses. Two confirmed deaths and an unknown number of undiagnosed infections across more than a decade suggest a problem that has outgrown the current response.
For residents of New York and the Northeast heading into summer, the practical takeaway is straightforward: Lone Star ticks carry risks beyond Lyme disease, and the medical system is not yet equipped to catch every one of them.
When a rare virus starts showing up in the most densely populated region of the country and the best answer from public health authorities is a webpage, taxpayers and patients deserve to ask whether anyone in charge is paying attention.
