Why Did Wooter Bassen's Anti-Fertility Vaccine Work?

The South African military establishment embarked on a different scheme, an anti-fertility vaccine. Scientists under Bassen later testified that they understood they were developing a vaccine which would be administered to black women without their knowledge or consent in order to render them infertile. The initial goal of Bassen and his fellow scientists was to develop a vaccine that would only work on black women. This obviously proved to be impossible because black women are genetically the same as any other kind of woman.