Which event in the HIV/AIDS timeline happened LAST? (1 point) Responses American doctors observed an atypical combination of symptoms in men. American doctors observed an atypical combination of symptoms in men. Expanded airline travel increased the spread of HIV in Africa. Expanded airline travel increased the spread of HIV in Africa. French and American researchers identified the virus that causes AIDS. French and American researchers identified the virus that causes AIDS. HIV traveled from Africa to the United States, undetected by epidemiologists.
Expanded airline travel increased the spread of HIV in Africa.
The event in the HIV/AIDS timeline that happened LAST is: French and American researchers identified the virus that causes AIDS.
To find out which event in the HIV/AIDS timeline happened last, we can look at the provided options and determine the chronological order in which these events occurred.
1. American doctors observed an atypical combination of symptoms in men.
2. Expanded airline travel increased the spread of HIV in Africa.
3. French and American researchers identified the virus that causes AIDS.
4. HIV traveled from Africa to the United States, undetected by epidemiologists.
By comparing the events, we can see that the observation of an atypical combination of symptoms in men by American doctors most likely refers to the initial discovery of what would later be identified as symptoms of HIV/AIDS. This event would have preceded the identification of the virus by researchers and the spread of HIV through airline travel.
Next, we can deduce that the identification of the virus by French and American researchers occurred after the initial observation of symptoms, as it required further investigation and scientific research.
Lastly, the event of HIV traveling from Africa to the United States, undetected by epidemiologists, would have happened after the virus was identified, as the identification of the virus would have been required to determine its origin and travel patterns.
Based on this analysis, we can conclude that the event "HIV traveled from Africa to the United States, undetected by epidemiologists" happened last in the timeline.