It goes on about genital ulcer, pushes circumcision and still admits that it doesn’t explain the data.
“Transmission of simian retroviruses to humans is not exceptional.”
But this one is different.
“Simian foamy viruses (SFV) have frequently been transmitted to humans exposed to bushmeat, apparently without further spread  and the epidemic human T-cell lymphotropic viruses (HTLV) arose from their simian counterparts (STLV) through contacts over thousands of years. It is generally accepted that SFV, STLV, as well as SIV, entered the human population through bushmeat handling. Although such events are common today –, and therefore assumed to also have been common in the recent and distant past, they seldom result in a virus with epidemic potential. Despite progress in identifying SIVs closely related to HIV groups –, , how and why only some of the transmitted SIV strains established epidemics is subject of ardent debate”
That’s as close as an academic gets to I know I’m lying but I need to get this published.