At a virtual press conference held by the World Health Organization (WHO) on Dec. 28, 2020, WHO officials warned there is no guarantee that COVID-19 vaccines will prevent people from being infected with the SARS-CoV-2 virus and transmitting it to other people.1 In a New Year’s Day interview with Newsweek, Anthony Fauci, MD, Director of the National Institute of Allergy and Infectious Diseases (NIAID), reinforced the WHO’s admission that health officials do not know if COVID-19 vaccines prevent infection or if people can spread the virus to others after getting vaccinated.2 According to U.S. and WHO health officials, vaccinated persons still need to mask and social distance because they could be able to spread the new coronavirus to others without knowing it.3 4
What we still don't know about COVID-19Ask whether those who do get vaccinated can still pass the virus onto others, Fauci told Newsweek: "That's a good question. We don't know that yet. We do not know if the vaccines that prevent clinical disease also prevent infection. They very well might, but we have not proven that yet.