The World Health Organization (WHO) says about 80 cases of monkeypox have been confirmed in 11 countries and has warned that more infections are likely to be reported.
The WHO says another 50 suspected cases are being investigated but did not name any countries.
Earlier, infections were confirmed in Italy, Sweden, Spain, Portugal, the US, Canada and the UK - where the first European case was reported.
Monkeypox is most common in remote parts of Central and West Africa.
It is a rare viral infection which is usually mild and from which most people recover in a few weeks.
The virus does not spread easily between people and the risk to the wider public is said to be very low.
There is no specific vaccine for monkeypox, but a smallpox jab offers 85% protection since the two viruses are similar.