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A MaineA resident has been admitted to the hospital with the first human case of the rare Powassan virus transmitted by ticks this year.
Maine Center for Disease Control and Prevention (Maine)CDC) mentioned the hospitalization of an unnamed resident from Hancock County this week, stating that the Powassan virus was responsible for the illness.
A rare virus, transmitted from animals to humans, typically through a tick or woodchuck bite, can lead to a severe brain infection for which there is currently no cure, no vaccine, and no recognized antiviral therapies.
If the Powassan virus (POWV) reaches the brain, it may lead to swelling in the brain and the tissues that cover the brain and spinal cord.
The CDC states that 10 percent of individuals diagnosed with Powassan virus neuroinvasive disease pass away, while half of those who recover experience lasting neurological issues like memory impairment and muscle weakness.
In 2024, there were 57 reported cases of the Powassan virus in humans, leading to 6 fatalities.
No details are available about the patient's health except for the fact that they experienced neurological symptoms.
The case of Maine arises asExperts claim this year is the worst for ticks.a season on record because of a milder winter throughout the US, enabling more ticks and their animal hosts to endure the winter period.
Consistent with other tick-borne illnesses, the number of human cases of Powassan virus has gradually increased over the last ten years in the United States, a pattern some attribute toclimate changeand removing more land for construction.
Cases are rising throughout the Midwest and Northeast, and they are most frequent during the summer season when ticks are prevalent.
After the Powassan virus case in Maine, the CDC is advising people living in or visiting the state to be cautious in regions where ticks could be found to avoid being bitten.
The Powassan virus gets its name from the city where it was first identified, Powassan in Ontario, where it was found in a young boy in 1958.
An individual may typically experience signs of the virus anywhere from one week to a month following a tick bite.
Early signs may involve a fever, migraines, nausea, and overall tiredness.
The illness may then reach the brain and lead to swelling.
At this point, some of the more serious symptoms may involve changes in mental state, seizures, speech difficulties (such as aphasia or dysarthria), paralysis, and movement issues.
A person from Maine was said to have experienced significant neurological issues due to their illness. They are currently being treated for the infection at a hospital.
The CDC states that most individuals who contract the virus show no symptoms.
The official organization has documented 397 instances of the virus since 2004, along with 50 fatalities.
Across the country, the number of cases has been rising consistently each year, reaching a peak in 2024 with 57 patients.
Instances of the Powassan virus are very uncommon.
In Maine, fewer than 20 cases have been documented in the past 12 years, although the presence of asymptomatic infections suggests the actual number may be higher.
In the United States, the most prevalent tick-transmitted illness is Lyme disease, which has over 470,000 new cases each year, though only a tiny portion of these lead to fatalities.
Although Lyme disease is the most common, there are at least 20 additional tick-borne illnesses in the United States, such as anaplasmosis, babesiosis, ehrlichiosis, and Rocky Mountain spotted fever.
However, ticks are not the only danger.
Diseases transmitted by mosquitoes, including West Nile virus and dengue fever, are increasingly common as temperatures rise and rainfall patterns shift.
The West Nile virus is now the primary source of mosquito-transmitted illness in the United States. This week, mosquito specimens from two locations in Ohio have shown positive results for the virus.
This year, 98 human cases of West Nile virus have been reported in the United States, with 53 of them classified as severe or "neuroinvasive."
Meanwhile, the United States reported dengue outbreaks in 2024 that have extended into 2025.
Dengue transmission within the local area was noted last year in California, Florida, and Texas. In 2025, Florida reported instances of locally transmitted dengue, with four confirmed cases of 'locally acquired' dengue identified in Brevard County.
As of 2025, a total of 2,553 instances of dengue fever have been reported.
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