The Vaccine Reaction reported:
Finally, the World Health Organization (WHO) is also not particularly bullish on the ability of COVID-19 vaccines to control the SARS-CoV-2 contagion. “I don’t believe we have the evidence on any of the vaccines to be confident that it’s going to prevent people from actually getting the infection and therefore being able to pass it on,” said the WHO’s chief scientist, Dr. Soumya Swaminathan.
In short then, what has been measured in the trials on the BNT162b2 and mRNA-1273 vaccines, as well as other experimental COVID-19 vaccines, is not whether they prevent infection with and transmission of the SARS-CoV-2 virus but how well they can prevent or minimize symptoms of COVID-19 disease that can be caused by the virus. There is no evidence to suggest the vaccines will have any effect in terms of protecting people from getting the virus and spreading it.