San Mateo County health officials said on Saturday they have reported the first known case of clade I mpox in California and the United States.

According to the San Mateo County Health, a person became infected with the clade I mpox after traveling in Eastern Africa, thats where there is a current outbreak of the strain. Another strain of mpox, called the clade II, has been circulating in the U.S. since 2022.

San Mateo County health officials added the person has mild symptoms and is currently recovering at home. The county is also contact tracing anyone who might have been in contact with the infected person.

Officials said that the threat of clade I mpox to the public remains low at this time.

This story is developing. Check back for updates.

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