If both parents pass this gene mutation on, you are very likely to be able to repel either AIDS, or the plague - as they both attack cell membranes in a similar way.
The human body is a remarkable thing - Ignorance and fear are the real enemy.
I wouldn't hold your breath for this type of thing to be out as a 'One Shot Cure'. Five years would be pushing it, and that assumes authorities allowing the drug to be used 'compassionately', i.e. 'You're going to die, our untested drug might cure you, or blow your liver up. Either way you'll die, so we can offer it to you at risk.'
"There's gonna be people f***ing in the streets the day they end that thing. 'Hey, they've found a cure, let's screw!'"
But god knows how long it will take to synthesise a "cure".
Hmmm, it could help ~quite~ a few people...