Pfizer tests experimental drugs on Africans leading to numerous deaths

In 1996 during a bacterial meningitis outbreak in Nigeria, the pharmaceutical giant Pfizer, illegally used a test drug on the local population. "Those reportedly treated by the company ended up with adverse effects like deafness, muteness, paralysis, brain damage, loss of sight, slurred speech and death." I find it interesting that pharmaceutical companies choose to test in Africa...why is that? Perhaps the developed world is too good for testing and thus opt to use Africans as their Guinea pigs. Today Pfizer settled out of court with the government of Nigeria in an attempt to further hide the truth of their inhumane testing practices.
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All Africa
Washington Post