Antibodies are Y-shaped proteins than bind to one's foreign invaders, like viruses, bacteria, fungi and parasites.What are the different types of coronavirus tests?There are three broad categories of coronavirus tests in the U.S.
Two diagnose whether you have an active infection, and a third indicates if you previously had the virus.Here’s how they work:Most tests look for bits of the virus’ genetic material, and require a nasal swab that is taken by a health professional and then sent to a lab.