Monkeypox – first reported in the UK in September 2018 – is regarded as a mild condition in most cases, which will have no long-term impact on health and take a few weeks to recover from without the need for treatment.
It is possible for a rash to develop beyond the initial symptoms, which include fever, headache, muscle aches, swollen lymph nodes, chills, exhaustion and backache.
The virus is similar to smallpox and can be fatal, but is considerably milder in the vast majority of cases.
According to the WHO, human cases are mostly reported in rural parts of central and western Africa, with the largest documented outbreak said to have come in Nigeria in 2017.
The first case outside Africa was in the US in 2003.
In December 2019, one case was discovered in England – the fourth case diagnosed in the UK since 2018.