The watchdog said that the viral disease had been discovered in a young man who returned from a trip around European countries and visited a doctor, having developed a typical rash. A medical analysis of the patient's biomaterials confirmed that he was infected with monkeypox.
The patient has been isolated and the disease is proceeding in a mild form, it said.
Those in contact with the patient are currently under medical supervision.
Monkeypox is a relative of smallpox or "black pox," which used to kill entire cities in Europe.
However, unlike the latter, it has a low mortality rate – from 1% to 10%, while up to 30% of patients died from smallpox.
Scientists have established that monkeypox was transmitted to humans from rodents, in particular the African striped squirrel, striped mice and dormice, the Gambian pouched rats, rusty-nosed rats, and brush-tailed porcupines.