So far, COVID-19 vaccines have been effective against variants of the coronavirus. Scientists are monitoring the situation carefully, with updated or new vaccines a possibility in the future, if need be.
COVID-19 vaccines do not contain a live virus, so there isn’t a biological path for a vaccinated person to “shed” the SARS-CoV-2 spike protein to those around them. Nor is there any evidence the vaccines cause reproductive problems. That means there’s no basis for social media claims that “shedding” causes reproductive issues in unvaccinated people.
There is no evidence that vaccines could cause harm to people who already have been infected with SARS-CoV-2 or have become ill with the disease COVID-19. On the contrary, recent studies show the vaccine gives an important immunity boost to those previously infected and suggest that one dose might be enough.
Stanford Medicine says it “strongly supports the use of face masks to control the spread of COVID-19.” Yet viral stories falsely claim a “Stanford study” showed that face masks are unsafe and ineffective against COVID-19. The paper is a hypothesis, not a study, from someone with no current affiliation with Stanford. Update: The paper was retracted.