Did early cases of HIV appear wherever the Koprowski vaccine was tested?
No. The vaccine was tested in several places in Europe and Africa, including Poland, Switzerland, Croatia, Burundi and Kinshasa (DR Congo). Early cases of AIDS were seen only in Central Africa. If the vaccine had been contaminated with HIV or a similar virus, it is likely that at least some of the people who were vaccinated in the European countries would have contracted the virus as well.