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If left untreated, donovanosis causes nasty genital ulcers which grow and spread before flesh in the groin region starts to eat itself.
There have been no previous cases of the the disease which is usually only found in far-flung tropical and subtropical countries such as southeast India, Guyana and New Guinea.
The British Association for Sexual Health and HIV (BASHH) say they have carried out past searches for UK cases, but appear to have drawn a blank.
How is donovanosis spread?
Sex with an infected person is not the only means of catching the disease which affects twice as many men as women.
Simple contact with a victim's bleeding ulcer is enough for it to be passed on.
“Donovanosis itself can be treated with antibiotics, time is of the essence.
"Any delay could cause the flesh around the genitals to literally rot away.
“This bacteria is also a risk factor in the transmission of HIV.”
A spokesperson for Public Health England added: "Donovanosis primarily occurs in tropical countries or regions of the Americas, Southern Africa and Oceania.
“It is very rarely diagnosed and reported in the UK."