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You may already have SARS-CoV-2 and fail to notice it. Symptoms may fail to develop in other people who have contracted COVID-19. Experts believe that testing for antibodies helps understand how common the virus is. By knowing who has had the virus, they will know how sick the virus makes the majority of the people. It will also give them a clear picture of what may happen when reinfection happens. Scientists will discover who may develop immunity to the virus by conducting further research.
