Vaccines Need Not Completely Stop COVID Transmission to Curb the Pandemic
Lessons from other viruses show that even if vaccines don’t completely stop disease spread, they can still successfully contain it
https://www.scientificamerican.com/article/vaccines-need-not-completely-stop-covid-transmission-to-curb-the-pandemic1/
"The inactivated polio vaccine (IPV) protects against systemic infection and consequent paralysis but does not stop viral replication in the gut, so it offers no indirect protection to unvaccinated individuals."