evidence: Viral shedding is associated with live attenuated vaccines, such as the MMR vaccine and chickenpox vaccine. This occurs because the weakened viruses used in live vaccines still retain the ability to reproduce themselves using our cells’ protein-making machinery. However, none of the COVID-19 vaccines available to date use live viruses. In addition, COVID-19 mRNA vaccines don’t induce high-enough levels of spike protein production that would lead the protein to be excreted. Scientific studies showed that SARS-CoV-2 infection causes shedding, but not vaccination.