We do not know whether the vaccine will prevent infection and protect against onward transmission.”

Strategic Advisory Group of Experts (SAGE). The Moderna COVID-19 (mRNA-1273) vaccine: what you need to know. The World Health Organization (WHO). 26 January 2021. https://www.who.int/news-room/feature-stories/detail/the-moderna-covid-19-mrna-1273-vaccine-what-you-need-to-know.