A British military health worker has been declared free of Ebola after being the first patient in the world treated with an experimental drug.

Corporal Anna Cross, 25, was admitted to the Royal Free Hospital on 12 March after contracting the disease.

She said she decided to allow doctors to use MIL 77, which they acquired from China, after "careful consideration".

Speaking at a news conference in London, she recalled her response when asked whether she was prepared to try the experimental drug.

"I said: 'I have Ebola, so I'd rather that than high-dose vitamin C. I'll have what drugs you think are good for me,'" she told reporters.

MIL 77 is a close relative of ZMapp, which scientists claimed healed 18 monkeys given a lethal dose of Ebola.

Doctors at the hospital acquired the drug from a company in China and Cpl Cross chose to be treated with the MIL 77 following "careful consideration," she said.

Cpl Cross thanked the medical team who looked after her and added she cried when she heard she was free of the virus.

"They are an absolutely incredible bunch of clinicians; incredibly skilled, incredibly intelligent," she said. "Thanks to them, I'm alive."

Cpl Cross had been working at a British built Ebola crisis centre in Kerry Town, southwest of the capital Freetown when she was diagnosed with the disease.

She was evacuated back to the UK by the RAF after becoming the third Briton to test positive for the virus.

"I was diagnosed by one of the military doctors out there," she said. "They did a blood test on me, then they came and told me personally. It was somebody that I knew really well, and I knew they were gutted to tell me."

Describing how she dealt with being treated as a patient after working as a nurse at the facility, Ms Cross said the experience of others in the hospital made her strong.

"I had treated a patient in the facility and the next day I was sitting with him. So it was nice, in a sense, because I felt like we were having the same experience.

"I have seen patients who got really sick and died but he was doing really well, which was encouraging for me."

Cpl Cross said her family were delighted to learn of her recovery.

"They are really thrilled. They are fighting to look after me at the moment," she said.

Although she has no plans to return to Sierra Leone, Cpl Cross intends to rejoin the military as soon as she is fit again.

"I have to do a lot of physical work, it is going to take me a long time," she said.

British nurses Pauline Cafferkey and Will Pooley also contracted the disease in Sierra Leone and both survived the disease after being treated in the UK.

The current outbreak of Ebola has killed more than 10,000 people in West Africa.