The World Health Organization (WHO) has urged governments around the world to take urgent measures to prevent the spread of monkeypox infections in Europe.
In Europe, the number of cases of monkeypox has tripled in two weeks.
"Governments and civil society should expand their efforts to prevent monkeypox from establishing as an infectious disease beyond the region," said Hans Kluj, head of the WHO European office.
In addition, he said, "To stop the spread of monkey pox, it is essential that we enter into emergency measures in coordination with each other."
Monkey smallpox is a viral disease known to be endemic to some countries in Central and West Africa. Since May of this year, several cases of infection and suspected cases have been reported in the United States and Europe.
90% of cases of monkeypox worldwide have come from Europe, with 4,500 cases in 31 countries.
WHO has not currently determined that monkeypox is a public health emergency, but will review it later.