An additional risk of drug addiction,especially of $heroin$,is

The full form of $AIDS$ is:

If a patient is advised Anti Retroviral Therapy,which infection is he suffering from? Name the causative organism.

Which method is used for the diagnosis of $AIDS$?

Approximately how many people have died worldwide due to $AIDS$ since its first report?

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.