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It usually has to be taken within 3 to 5 days of having unprotected sex but the sooner it is taken, the more effective it is.

On effective antiretrovirals, they can’t pass on the virus, even through unprotected sex, and can expect normal lifespans.

Marburg, which is not airborne, can be transmitted by exposure to fruit bats and between people via body fluids through unprotected sex and broken skin.

"I didn't know we were having unprotected sex," she told the broadcaster.

She said she was groomed by an "older man" and at 15 years old "didn't know we were having unprotected sex".