Cases of monkeypox are being investigated in European countries, including the UK as well as the US, Canada and Australia.
Monkeypox is caused by the monkeypox virus, a member of the same family of viruses as smallpox, although it is much less severe and experts say chances of infection are low.
It occurs mostly in remote parts of central and west African countries, near tropical rainforests.
There are two main strains of virus - west African and central African.
Two of the infected patients in the UK travelled from Nigeria, so it is likely that they are suffering from the