And should we be afraid?
Monkeypox can cause fever, aches and a distinctive bumpy rash.
Most people fully recover in two to four weeks.
But is usually milder, particularly the West African strain, which has a fatality rate of around 1%.
The first human case of monkeypox was recorded in 1970 in the Democratic Republic of Congo.
As of May 21, 92 confirmed cases of monkeypox had been reported from 12 states (in Europe, the US, Australia and Canada,) according to WHO.