California has reported the first US case of mpox - formerly known as monkeypox - that is part of a new outbreak.The state's department of health, the CDPH, said the new case was from the Clade I strain - different from the Clade II strain that has been in circulation in the US since 2022.

Human cases of Mpox date back to the 1970s in the Democratic Republic of the Congo, according to the National Institutes of Health. But in recent years the virus has spread globally, and the CDC says over 100,000 people have been infected with the clade II strain.

Mpox is a rare disease caused by infection with a virus that’s in the same family as the one that causes smallpox. It is endemic in parts of Africa, where people have been infected through bites from rodents or small animals. Milder symptoms can include ...

The first known case of clade I mpox in the U.S. was recently discovered in a person in California, the Centers for Disease Control and Prevention said Saturday.