Nine cases of monkeypox have now been confirmed in Ireland.
The Health Protection and Surveillance Centre says all cases are in men aged between 30 and 50.
The HPSC says Public Health is following up with anyone who had close contact with cases while they were infectious.
More than 1100 cases have been identified worldwide, with the majority in gay or bi-sexual men.
Professor of Experimental Medicine at Imperial College London, Peter Openshaw, says it's important the virus is stopped from spreading:
"I do think this is a bit of a concern and if it were to get into populations say in primary schools, children are more susceptible, that could be more of a problem. So I think it is a public health concern and we do need to find cases notify them and try and prevent."
