Nothing's perfect, but ebola levels of paranoia drastically slow down any chance of spread.
While partial resistance can be encouraged in a single person, that doesn't matter if it dies inside them. And if a resistance mutation happens in the wild, away from drugs, there's no reason to expect it to spread at all.
There's a significant amount of fake news around the Ebola outbreak epicenters, such as aid workers trying to take people's blood and other conspiracy theories. We have to keep in mind some of these places recently had a genocide and/or are generally unstable.
While partial resistance can be encouraged in a single person, that doesn't matter if it dies inside them. And if a resistance mutation happens in the wild, away from drugs, there's no reason to expect it to spread at all.