They don't prevent infection, so signing up for ongoing jabs two or more times per year is not the pre-2020 understanding of an effective vaccine. In fact, CDC

They don't prevent infection, so signing up for ongoing jabs two or more times per year is not the pre-2020 understanding of an effective vaccine. In fact, CDC says natural infection and recovery is good protection. https://www.cdc.gov/mmwr/volumes/71/wr/mm7104e1.htm https://www.cdc.gov/mmwr/volumes/71/wr/mm7104e1.htm 'By early October, persons who survived a previous infection had lower case rates than persons who were vaccinated alone.'