Covid-19 vaccination prevents transmission from vaccinated to unvaccinated household members.

The indirect effect of mRNA-based Covid-19 vaccination on unvaccinated household members – medRxiv

Related: Can people vaccinated against COVID-19 still spread the coronavirus? – “Preliminary evidence seems to suggest the COVID-19 vaccines make it less likely someone who’s vaccinated will transmit the coronavirus”.

Commentary on Twitter

More on less transmission, yet another incentive:
"Our results suggest that mRNA-based vaccines do not only prevent #SARSCoV2 infections among vaccinated individuals but lead to a substantial reduction in infections among unvaccinated household members"https://t.co/sIqoOLiH3b pic.twitter.com/6rv2tojR2m

— Eric Topol (@EricTopol) May 29, 2021