Health officials have confirmed a U.S. case of an aggressive new form of mpox, detected in northern California in someone who had recently traveled to eastern Africa, per the California Department of Public Health.

The patient was traveling from East Africa, where the mpox disease is endemic. The CDC says the strain does not present a high risk to the general population.

The United States’ first known case of a more severe strain of mpox was confirmed in California, the US Centers for Disease Control and Prevention said Saturday. The risk of clade I mpox to the public remains low,