Monkeypox is spreading through community transmission in the UK with more cases being detected daily, a senior doctor has warned.

The UK Health Security Agency (UKHSA) has confirmed 20 cases of the disease in the UK with nine other countries outside of Central and West Africa also reporting outbreaks.

The disease, which was first found in monkeys, can be transmitted from person to person through close physical contact – including sexual intercourse – and is caused by the monkeypox virus.

Dr Susan Hopkins, a chief medical adviser for UKHSA, said updated figures for the weekend will be released on Monday as she warned of more cases “on a daily basis”.

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What is monkeypox?

Monkeypox cases are usually found in West Africa, and the virus does not often spread elsewhere.

That is why outbreaks reported in Britain, Portugal, Spain and the United States have cased alarm among public health experts.

The disease, which was first discovered in monkeys, is usually mild but can cause severe illness in some cases.

What are the symptoms?

Symptoms of monkeypox include fever, headache, muscle aches, backache, swollen lymph nodes, chills and exhaustion.

A rash can develop, often beginning on the face, which then spreads to other parts of the body including the genitals.

The rash can look like chickenpox or syphilis, and scabs can form which then fall off.

The incubation period of monkeypox is usually from six to 13 days but can range from five to 21 days.

What has happened in the UK?

Speaking to BBC One’s Morning Show, Dr Hopkins said: “We are detecting more cases on a daily basis and I’d like to thank all of those people who are coming forward for testing to sexual health clinics, to the GPs and emergency department.”

Asked if there is community transmission in the UK, she said: “Absolutely, we are finding cases that have no identified contact with an individual from west Africa, which is what we’ve seen previously in this country.

Bucks Free Press: A doctor has warned that monkeypox cases are on the rise (PA)A doctor has warned that monkeypox cases are on the rise (PA)

“The community transmission is largely centred in urban areas and we are predominantly seeing it in individuals who self-identify as gay or bisexual, or other men who have sex with men.”

Asked why it is being found in that demographic, she said: “That’s because of the frequent close contacts they may have.

“We would recommend to anyone who’s having changes in sex partners regularly, or having close contact with individuals that they don’t know, to come forward if they develop a rash.”

Monkeypox is not normally a sexually-transmitted infection, but it can be passed on by direct contact during sex.

It can also be spread through touching clothing, bedding or towels used by someone with the monkeypox rash, and through the coughs and sneezes of somebody with the infection.

What does the UK Health Security Agency say?

The virus spreads through close contact and the UKHSA is advising people, particularly those who are gay, bisexual or who have sex with men, to be alert to any unusual rashes or lesions on any part of their body.

Anyone who is worried is advised to contact sexual health services and to call ahead for an appointment, or to call 111.

The UKHSA said the virus does not usually spread easily between people and the risk to the UK population overall remains low.