An amazing discovery was made at a research clinic in Nairobi in the 1980s. While scientists were studying the outbreak of HIV and AIDS among the country's citizens, they came upon a group of female prostitutes.
These women who should have been the most susceptible to HIV consistently tested negative for HIV over the years.
It turned out that this small percent of women coming into the clinic, about 5%, had somehow developed an immunity to HIV. Their immune systems were able to recognize and then kill HIV. This was a remarkable discovery.
Scientists ruled out the possibility of these women simply being extremely lucky by looking at the statistics. They found that most of the women had had between 500-2,000 unprotected sexual encounters with infected men.
In fact, the scientists found that the longer a woman had been a prostitute, the less likely that she would be infected with HIV/AIDS.