As warm weather approaches New York City (NYC) and classes conclude for the summer, millions of people are beginning to enjoy outdoor activities.
However, the NYC Health Department issued Advisory #13 on June 6, 2025, concerning the health risks associated with tick-borne diseases (TBDs).
Tick-borne Diseases Arrive in New York City
Yellow Fever Returns to the Americas
Once thought to be on the decline, the mosquito that transmits the yellow fever virus has been infecting more people than usual in the Region of the Americas.
Initially detected in the 17th century, the increase in the number of cases in 2025 from the previous year reflects, in part, a periodic reactivation of sylvatic transmission cycles in the Amazon basin.