The first cases of smallpox in monkeys have now been identified in Wales and Northern Ireland, according to reports.
There has been a rare outbreak of the virus worldwide, with 19 countries confirming infections, and new cases bring the UK total to around 80.
It is spreading across the UK via community transmission, with infections being detected daily.
The virus, which is commonly reported in Central and West African countries, causes a rash and fever, but the symptoms are mild for most people.
Read more: What are the symptoms of monkeypox and how do you catch it?
Dr Giri Shankar, Director of Health Protection at Public Health Wales, said: “Public Health Wales confirms today (Thursday 26th May) that a case of smallpox has been identified in Wales.
“We are working with the UK Health Safety Agency (UKHSA), the Scottish Public Health Agency and the Northern Ireland Public Health Agency, and we are ready to respond to cases of smallpox in Wales. the.
“The case is being handled properly. To protect patient confidentiality, no further details related to the patient will be disclosed.”
He added: “We are reassuring people that smallpox is not easily spread among people and that the overall risk to the general public is low.
“In general, it is a mild, self-limiting disease, and most people recover within a few weeks. However, in some individuals, serious illness can occur.”
According to the PA news agency, health officials in Northern Ireland are expected to hold a briefing later, after the first case has been identified.
Read more: What we know about the biggest smallpox outbreak in the UK
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14:32 Monkeypox: Your questions have been answered
Risk for UK population ‘remains low’
The number of confirmed cases in the UK will increase later on Thursday, when the UKHSA updates its figures.
Despite the increase, the UKHSA has said that the risk to the general population of the UK is “being low”.
Gay and bisexual men, and men who have sex with men, are particularly asked to know the symptoms, especially if they have recently had a new sexual relationship.
UKHSA teams have tracked the contacts of those with a confirmed case and advise those most at risk to be isolated for 21 days.
A smallpox vaccine is also offered to close contacts to reduce their risk of symptoms and serious illness.
Anyone who is concerned that they may be infected with monkeypox is advised to contact NHS 111.