If we look to the history of other nations, ancient or modern, we find no example of a growth so rapid, so gigantic, of a people so prosperous and happy. ↗
Another interesting field, which is my own, is cofactors, not only to the disease but also to transmission. I am still puzzled by the fact that you get more sexual transmission in some ethnic populations. One way to answer this is to look for genetic factors. ↗
One could not have isolated this retrovirus without knowledge of other retroviruses, that's obvious. But I believe we have answered the criteria of isolation. ↗