HIV/AIDS activists in the 1980s were critical of the Reagan administration was slow to act on the pandemic as it emerged.
Screening of donated blood for HIV/AIDS was not instituted within the United States of America until January 1985.
Let's imagine that either in 1981 during surgery after the assassination attempt, or during his colon surgery, if it's brought forwards from it's OTL date of July 1985 happens earlier before the screening is introduced, that Ronald Reagan receives blood which is contaminated with HIV and contracts the disease.
How does this change:
1) The Reagan administration's response to HIV/AIDS?
2) Societal attitudes toward HIV/AIDS?
3) National opinion of Ronald Reagan, particularly among his conservative Christian base.
4) Anything else you would care to mention?