David Walliams, is said to be undergoing test to determine if he is suffering from Weils disease after his recent 140-mile charity swim along the Thames.
The Little Britain star first became ill during his epic 140 mile Thames swim for, but the symptoms – including fever, diarrhoea and muscle pain – have persisted and doctors now fear David could be suffering from the life threatening illness.
"The first signs were during the swim — the sudden fever, the diarrhoea and the rash,” a source told The Sun.
"The extreme and continued muscle and joint pain and the fact he is still extremely fatigued and feverish show all the classic signs of Weil's. He is undergoing tests but at least he's in good hands."
Weil’s disease is contracted when a person comes into contact with water that has been contaminated by infected animal urine.
Before Walliams set off on his swim he had been given inoculations and a precautionary course of antibiotics, but, as a result of heavy rain, some 132 million gallons of raw sewage had entered the river over the previous week.
By day three, Walliams was falling behind schedule after becoming “very poorly” with a high temperature, vomiting and diarrhoea.
The 40-year-old actor and comedian said at the time: “This is already much harder than I thought it would be, but this Thames tummy I’ve got is making the task seem incredibly difficult.”
Walliams has made it clear that he is unlikely to be doing any more charity swims.