Arvid Noe used prostitutes in West Africa, confirming the prostitute hypothesis re transmission.
It appears that prostitutes had been 'brewing' up HIV 1 amngst themselves and transmitting it from the first tranmission via the prostitutes employed by Dr. Ilya Ivanov.
Noe began his career as a sailor in 1961, when he was 15 years old. Journalist Edward Hooper established that Noe had twice visited Africa as a sailor: First from mid-1961 to mid-1962 when Noe worked on the merchant vessel Hoegh Aronde, which traveled the west coast of Africa to Douala, Cameroon (Noe was treated for gonorrhea on this journey); and again in 1964, when he reached the port city of Mombasa, Kenya in eastern Africa.
About a decade after Noe's death, tests by Dr. S.S. Frøland of the Oslo National Hospital concluded that blood samples from Noe, his daughter and wife all tested positive for HIV.
Based on research conducted after his death, Noe is believed to have contracted HIV in Cameroon in 1961 or '62, where he was known to have been sexually active with many women, including prostitutes. Noe was infected with HIV-1 group O, which is known to have been prevalent in Cameroon in the early 1960s.
During his tenure as a trucker (from 1968 to 1972), Noe picked up many prostitutes and almost certainly gave some HIV; these women almost certainly passed the disease on to other clients. Bisexual German violinist Herbert Heinrich was infected with HIV/AIDS ca. 1975 and died in 1980. Heinrich was known to hire prostitutes, and there has been speculation that Heinrich might have been infected by the same HIV-1 group O that Noe had, but as of 1997, this notion was unproven.