Mpox, formerly known as monkeypox, drew global attention in 2022 during an outbreak that affected the U.S., Europe, Australia and many other countries. The virus comes in two distinct forms or "clades"—clade I and clade II—and spreads through close contact.

British health officials say they have identified four cases of the new, more infectious version of mpox that first emerged in Congo, marking the first time the variant has caused a cluster of illness