Give the full form of $\rm {ELISA}$. Which disease can be detected using it? Discuss the principle underlying the test.

Arrange the following statements regarding $AIDS$ in the correct chronological order of the infection process:
$(1)$ After entering the individual's body,the $HIV$ virus enters macrophages,where the viral $RNA$ genome replicates into viral $DNA$ with the help of the reverse transcriptase enzyme.
$(2)$ $HIV$ enters helper $T$-lymphocytes.
$(3)$ $HIV$ has an $RNA$ molecule as its genetic material.
$(4)$ Newly formed viruses are released into the blood and attack other helper $T$-lymphocytes.
$(5)$ Viral $DNA$ is incorporated into the host cell's $DNA$.

Identify the location and function of the following: $HIV$ Antigen and Amniotic bag.

Which of the following is $NOT$ a symptom of $ARC$ ($AIDS$-Related Complex)?

Into how many categories can individuals infected with $HIV$ be classified?

$AIDS$ causing factors are associated with