...wasnt contaminated production, it was the fact that thousands of vaccines would be given out with only a couple of needles....disposable syringes werent common til later....so because of the massive vaccine drive in Africa for smallpox and other things they rapidly spread AIDs from a couple people to a hell of alot....the vaccine wasnt the problem, improperly sterilized needles between patients was....
And don't forget that in Africa, as in most of the Third World, untrained merchants sell Penicillin (and other antibiotics) injections at roadside kiosks and door-to-door without making any effort to sterilize needles, syringes, or multiple-use vials of serum. Immunization injections are only part of the problem.
