Overview

• A Nassau County resident tested positive for chikungunya, the first locally acquired case in New York and the first such U.S. case since 2019.
• State investigators say the infection likely came from an infected mosquito species present in the region, such as Aedes albopictus.
• The patient developed symptoms in August and reported travel outside Nassau County during the exposure window but no international travel.
• Weekly testing of mosquito pools in Nassau County and broader state surveillance have not detected the virus, and officials report no signs of ongoing transmission.
• New York recorded three other chikungunya cases this year linked to international travel; the illness is rarely fatal, not spread person to person, and can be more severe for newborns, older adults, and people with chronic conditions.