News World AIDS Day 2018: 30 questions about HIV/AIDS, answered, for 30 years of World AIDS Day November 30, 2018 Ryan W. Miller, USA TODAY Comments Off on World AIDS Day 2018: 30 questions about HIV/AIDS, answered, for 30 years of World AIDS Day What's the difference between HIV and AIDS? What are PrEP and PEP? Here are 30 questions, answered, for the 30th anniversary of World AIDS Day.