Order of authorship in the original publication: Wolfe, Heniene, Carr ...Birx.... 

"As of 2016, 301 terrestrial mammals were threatened with extinction due to hunting for bushmeat including primates, even-toed ungulates, bats, diprotodont marsupials, rodents and carnivores occurring in developing countries.^[5]" Killing and processing bushmeat has created an increased opportunity for transmission of  "several zoonotic viruses from animal hosts to humans, such as Ebolavirus, HIV,^[6][7][8] and various species of coronavirus including SARS-CoV-2.^{[9]" (Wikipedia article on Bushmeat, accessed 4-2020).} 

Wolfe and colleagues analyzed blood of bushmeat hunters in Cameroon and discovered two novel viruses previously unknown: Human T-lymphopic virus-3 HTLV-3 and HTLV-4. They also reported that HTLV-3 is genetically similar to STLV-3 of monkeys and posited that this virus mutated and jumped from humans to monkeys. Available from pnas.org at this link.

(Thanks to Juan Weiss for this reference and its interpretation.)