Definitions: Antigen = the COVID-19 virus Antibody = immune cells to the COVID-19 virus We have antigen tests. We will have more antigen tests in the future. When the antibody tests go mainstream people will get tested for both. Antigen negative, antibody negative = You haven't yet contracted COVID-19, although you could be incubating a case of COVID-19. Antigen positive, antibody negative = You have a case of COVID-19 which you haven't begun to fight off. Antigen positive, antibody positive = You have a case of COVID-19 which you are fighting off Antigen negative, antibody positive = You've had a...