Johnson & Johnson Vaccine Hopefuls Turned Off by Recent Blood Clot Concerns Omari Fleming and Mari Payton © Getty Images
THORNTON, CO – MARCH 06: Adams 12 Five Star Schools District RN Tiffany Karschamroon draws a dose from a vial of the Johnson & Johnson COVID-19 vaccine, the newest vaccine approved by the U.S. FDA for emergency use, at an event put on by the Thornton Fire Department on March 6, 2021 in Thornton, Colorado. Colorado entered COVID-19 vaccination Phase 1B.3 on Friday, allowing essential grocery and agriculture workers, people over the age of 60 and people with two or more high-risk conditions to receive a vaccine. (Photo by Michael Ciaglo/Getty Images)
Johnson & Johnson Vaccine Hopefuls Turned Off by Recent Blood Clot Concerns
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UCSD researchers study long-term efficacy of coronavirus vaccine -
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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.