A person in California has tested positive for a form of mpox causing a widespread epidemic in Africa, the state’s Department of Public Health reported on Saturday. It is the first known case in the United States.

Health officials said Saturday they have confirmed the first U.S. case of a new form of mpox that was first seen in eastern Congo. The person had traveled to eastern Africa and was treated in Northern California upon return, according to the California Department of Public Health. Symptoms are improving and the risk to the public is low.

The individual is recovering after traveling from Africa, where an outbreak that has killed hundreds is spreading.