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Loading video. VIDEO: UC San Diego students can participate in a nationwide clinical trial to assess how well a COVID-19 vaccine prevents infection and reduces risk of transmission. Watch this video to learn. view more  Credit: UC San Diego Health Sciences COVID-19 vaccines were designed to reduce the likelihood that infection by the SARS-CoV-2 virus would lead to severe outcomes, such as hospitalization and death. In that sense, all of the currently approved vaccines Moderna, Pfizer and Johnson & Johnson have proven comparably effective. But much less is known about the actual ability of these vaccines to prevent infection, most notably asymptomatic cases in which vaccinated persons might not become ill or display symptoms, but could still carry sufficient levels of the virus to pose a potential transmission threat to others.

San diegoUnited statesUniversity of california san diegoCenters for diseaseNational institute of allergyPrevention network coResearchers at university of california san diegoUc san diego school of medicineFred hutchinson cancer research centerDiego schoolNew england journalDisease controlCalifornia san diegoNational instituteInfectious diseasesSusan little