A thought that just came to me:
AIDS is said to have originated in Africa where humans hunted chimpanzees for meat and came into contact with their infected blood. AIDS affected only gay men.
(later others were exposed through them.)
Ebola also originated in Africa where humans hunted bush meat but Ebola affected any human who came in contact like most viruses do.
Given the similarities of how both viruses originated, has any research been done on why gay men were so susceptible to one virus?
there doesn't seem to be anything here