The former Sky Sports host, 33, took part in a charity bike ride from London to Rio de Janeiro, where she was due to present coverage of the sporting extravaganza, but she became ill during the opening ceremony on 5 August (16) and was admitted to hospital to be treated dehydration and an infection.

However, a friend tells British newspaper The Sun Charlie's condition deteriorated and she was placed in an induced coma last week (ends14Aug16).

“Her kidneys stopped functioning and she was put on dialysis... Charlie's breathing became laboured and she was unable to breath unsupported," the insider said. "She remains in an induced coma and is on life support.”

This week doctors made their diagnosis and contacted British and U.S. medical specialists to help with the case.

“The doctors have now identified the very rare malaria strain she has contracted so she is receiving the right treatment in Rio, with advice being provided by the London School of Tropical Medicine," the friend said, adding she's "battling for survival at the moment".

Representatives for the presenter, who dated Downton Abbey star Allen Leech between 2014 and 2015, shared a link to the article on Twitter and thanked everybody for their support.