Should antibodies tests be used to diagnose a COVID 19 infection? In what situations are antibody tests useful?

please help explain would SARS-CoV-2 N-nucleocasid protein be good target for neutralizing antibodies and vaccine development ?and why

Two newly developed vaccine candidates (A and B) are tested in mice for their ability to elicit high concentrations of anti-meningococcal antibodies that would provide mucosal as well as bloodstream protection. Also, the ideal candidate vaccine should also provide long-lasting immunity to the infection. Below is a diagram of the results from the primary immunization with both candidate vaccines.  What is the predominant antibody isotype elicited by the primary immunization with these candidate vaccines? In which part of the body is that antibody primarily found?

There are many immunotherapeutics now being used to immunomodulate recipients that are either fully human monoclonal antibodies or partially humanized monoclonal antibodies. Discuss whether or not they may interfere with solid phase antibody assays, CDC assays or cell based flow cytometry crossmatches.

If you Infect the Jurkat T lymphocyte cell line with HIV-1 strain IIIB. Lyse the infected cells at the peak cytopathic effect and isolate DNA from the whole cell lysates. What minimum biosafety  Level (1-4) by the BMBL  will be used for this experiment?

What are the impacts of CoVID 19 on the routine normal immunization programs

Why do the ring sizes change until equivalence is reached in radial immunodiffusion?

What secondary antibody would I need if I purchase a rabbit anti Bax antibody?

. Design an ELISA assay for detecting the presence of anti-HIV antibodies in a patient’s serum sample.

Why does antibody titer rise after infection? Is ahigh antibody titer indicative of an ongoing infection?Explain