Since we’ve only been studying COVID-19 for 11 months, experts can’t project too far when examining how long someone remains immune. It also highlights that over 95% of the population tested had no antibodies, which isn’t promising for any level of herd immunity. READ: Health Department lists Port Huron bar as potential COVID exposure siteAnother new study from the journal Nature Microbiology looked at the antibody response of 65 people with COVID-19. There’s general agreement that the antibody response to COVID-19 is not permanent, but exactly how long it might be protective isn’t completely clear. In fact, a study just released Wednesday afternoon in the journal Science showed stable antibody levels for five months.