$AIDS$ is a

What is the normal count of $CD_4$ cells in a healthy human?

$HIV$ virus affects which of the following cells in the human body?
$(i)$ $T_H$ cells
$(ii)$ $T_1$ cells
$(iii)$ Mast cells
$(iv)$ Macrophages

In India,the $HIV$ virus was first reported in:

Which individuals are at higher risk of getting $HIV$ infection?

At which stage of $HIV$ infection do the symptoms of $AIDS$ appear?