Monkeypox cases appear to be declining in some large US cities

Experts say the trend in New York, Chicago and San Francisco appears to be linked to immunity and behavior changes

Monkeypox cases in some large US cities appear to be declining, matching trends seen in Europe, and experts are cautiously optimistic the outbreak may have peaked in places hit hardest by the virus.

The optimism comes just as US officials on Friday said there's enough of a supply of monkeypox vaccine available now - though the shots aren't getting to some of the people who need the protection the most.