There are currently 550 confirmed cases in England, 16 in Scotland, 2 in Northern Ireland and 6 in Wales.
In recent weeks around 1,600 cases have been detected globally – something experts say is ‘concerning’.
In the US, 100 cases have been confirmed, with New York and California being the worst hit places.
Anyone can get the illness – more so if you have been in contact or had sexual contact with a person who has symptoms.
A report by the UK Health Security Agency (UKHSA) last week revealed that most cases have been in men who are gay, bisexual or men who have sex with men.