Although the virus probably existed much earlier, the first direct evidence of HIV infection in humans is from blood samples that were obtained from patients in the Blank______.Multiple choice question.1930s1950s1970s1990s

HIV was identified in the U.S. around what year?*2 points199019801960None of the above

HIV most likely originated on which continent?Multiple choice question.AfricaSouth AmericaAsiaNorth America

The First evidence about the existence of viruses were provided by*1 point(A)Louis Pasteur(B)Ivanowsky(C) W.M Stanley(D)Charles Chamberland

All of the following are the examples of a biological specimen that can be taken for the laboratory diagnosis of HIV infection, EXCEPT?a.Genital secretionsb.Bloodc.Urine with no presence of bloodd.Saliva with the presence of blood

Following exposure to HIV-infected cells, the first cells to be infected in a new host are usually Blank______.Multiple choice question.gametes (egg or sperm)macrophagesepithelial cellsB cells