The finding that protection conferred by mRNA vaccines waned in the months after receipt of a third vaccine dose reinforces the importance of further consideration of additional doses to sustain or improve protection against COVID-19–associated ED/UC encounters and COVID-19 hospitalizations. All eligible persons should remain up to date with recommended COVID-19 vaccinations to best protect against COVID-19–associated hospitalizations and ED/UC visits.
https://www.cdc.gov/mmwr/volumes/71/wr/mm7107e2.htm
https://www.cdc.gov/mmwr/volumes/71/wr/mm7107e2.htm