A new monkeypox strain has been identified in the UK, linked with travel to West Africa.
One person has been admitted to the High Consequence Infectious Disease (HCID) unit at the Royal Liverpool University Hospital in Merseyside with the strain, the UK Health Security Agency (UKHSA) has said.
The agency said the strain is different from the one currently circulating, but may have been seen in the UK before. Tests are being undertaken to attempt to establish this.
Contact tracing is now being conducted to establish if there are any further linked cases.
As of Friday, no further cases had been identified.
She said: “We are working to contact the individuals who have had close contact with the case prior to confirmation of their infection, to assess them as necessary and provide advice.
“UKHSA and the NHS have well-established and robust infection control procedures for dealing with cases of imported infectious disease and these will be strictly followed and the risk to the general public is very low.
“We remind everyone who is planning to travel to West and Central Africa to be alert for the symptoms of monkeypox and to call 111 if you have symptoms on your return.”
Since the start of the outbreak there have been more than 3,000 cases of the original monkeypox strain in the UK, with most of these identified among gay and bisexual men in England.
Monkeypox is related to smallpox and cases are usually found in West and Central Africa, with the virus not often spreading elsewhere.
The disease, which was first discovered in monkeys, is usually mild but can cause severe illness in some cases.
Most monkeypox patients experience only fever, body aches, chills and fatigue, but some may develop a rash and lesions on the face and hands that can spread to other parts of the body.
The rash can look like chickenpox or syphilis, and scabs can form which then fall off.
Most people recover within a few weeks.