An mpox case in Sweden this month prompted the World Health Organization to declare a public health emergency, but the potentially-deadly strain of the virus has not yet made it to the United States.

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 ...

The first case of mpox clade I was found in California, but the risk to the public remains low, public health officials said Saturday. There are two types of mpox, clade I and clade II, according to ...