The “logistical” and “political” problems being that they’re endemic in countries with major political and economic instability, where the locals have a bad tendency to kill the people doing the vaccinations.
It isn’t a trivial problem. And oh yeah: Covid is in those countries now, too.
I never said they were trivial, and have argued exactly the opposite elsewhere. But it remains that they are logistical and political challenges, not biological ones.
It isn’t a trivial problem. And oh yeah: Covid is in those countries now, too.