On Aug. 18, 2023, the Maryland Department of Health has confirmed and reported a positive case of locally acquired malaria in a Maryland resident who lives in the National Capital Region. The individual was hospitalized and is now recovering. They did not travel recently outside of the United States or to other U.S. states with recent locally acquired malaria cases.

Malaria is a mosquito-borne disease caused by a parasite. More than 2,000 cases of malaria are reported annually in the U.S., according to the Centers for Disease Control and Prevention, with most cases occurring in people returning from international travel.

Symptoms of malaria usually appear 7 to 30 days after an infective bite and include high fever, chills, body aches, diarrhea and vomiting. 

“Malaria can be very dangerous and even fatal if it is not treated, but early treatment reduces the chances of complications,” said Deputy Secretary for Public Health Services Dr. Nilesh Kalyanaraman. “We urge the public to take precautions against mosquito bites, and if you develop symptoms after traveling abroad, seek urgent medical care.”

The risk to the public for locally acquired mosquito-transmitted malaria remains very low, according to the Centers for Disease Control and Prevention. However, Marylanders can take these precautions to prevent mosquito bites or travel-related malaria: