In an amazing example of medical technologic advancement, researchers have developed a pill that helps prevent HIV infection. This is a phenomenal story. When I was in medical school, the first stories of a strange new immunodeficiency affecting IV drug users and homosexuals were being reported. Within a few years, the virus was identified. A few years later, there a drug treatment for the viral infection; a few years later there were multi-drug treatment regimens that kept patients with the disease alive. Now we even have a pill that helps prevent infection in the first place.
The pace of discovery in this 30-year story is unprecedented. So much has been done for the identification and treatment of this condition that it basically dwarfs the progress of the first 5,000 years or so of recorded human history. We live in miraculous times and should appreciate it.