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

(N/A) The full form of $\rm {ELISA}$ is $\text{Enzyme-Linked Immunosorbent Assay}$.
It is primarily used for the detection of $\text{AIDS}$ (caused by $\text{HIV}$).
$\rm {ELISA}$ is based on the principle of antigen-antibody interaction.
Infection by a pathogen can be detected by the presence of antigens (proteins,glycoproteins,etc.) or by detecting the specific antibodies synthesized by the host immune system against the pathogen.