On Dec. 11, 2023, the U.S. Centers for Disease Control and Prevention (CDC) issued a Health Alert Network (HAN) Health Advisory to notify healthcare providers and the public about an outbreak of Rocky Mountain spotted fever (RMSF) among people in the United States with recent travel to or residence in the city of Tecate, state of Baja California, Mexico.

RMSF was found in urban areas of several states of northern Mexico, including but not exclusive to Baja California, Sonora, Chihuahua, Coahuila and Nuevo Le�n. Ticks spread the bacteria that causes RMSF. Ticks can live anywhere that dogs live. This includes close to peoples� homes and in their yards.