I was reading through Callahan's Crosstime Saloon by Spider Robinson, and I came across this passage:
Tom Flannery's there now, frozen like a popsicle, waitin' for them to invent a cure for AIDS; he tol' me about it.
In this same story,
Rebecca explains that she was born in 1741, making her 232 years old,
which means that the current year is 1973-1974 (I think other stories indicate that it's 1974, but the dialogue seems to indicate 1973, so maybe they are not in chronological order), but AIDS was rare (if present at all) in the US in the 70s, and wasn't even named AIDS until 1982.
Given that the book came out in 1977, I am assuming that this must have been a retro-fit in one of the later editions. Was this a retcon by Spider Robinson, or were people actually aware of AIDS and calling it that in the 70s? If it is a retcon - what did it replace, and has Spider Robinson ever revealed why he made this change?