In which country was $AIDS$ first detected?

How can $AIDS$ be prevented?

Identify the correct sequence for the mechanism of $HIV$ infection:
$1.$ Viral $RNA$ replicates to form viral $DNA$ with the help of reverse transcriptase.
$2.$ The progeny viruses released in the blood attack other $T_H$ cells and destroy them.
$3.$ Viral $DNA$ gets incorporated into the host cell's $DNA$ and produces virus particles.
$4.$ Virus enters into macrophages.

At which stage of $HIV$ infection does one usually show symptoms of $AIDS$?

What does $HIV$ cause a reduction in?

Which glycoprotein is present on the outermost surface of the $HIV$ virus?