"But blood tests showed that the baby had an active HIV infection. The virus had emerged from some mysterious hiding place in her body." Could the child not have just simply been re-infected? The mother has a demonstrated history of lacking healthy habits.
In the mid 20th century the polio virus was a serious health problem. But then came several different simple vaccines. They were highly effective, and polio quickly disappeared.<p>Now, after 50 years of incredible advances in medicine, we're still struggling to eradicate HIV. Incredibly tenacious bugger, isn't it?