Published on December 22, 2021, a Danish cohort study finds the Pfizer vaccine’s protection from infection against Omicron variant wanes after just 30 days and by 60 to 90 days has a negative efficacy for 76% of study participants.
Published on December 22, 2021, a Danish cohort study finds the Pfizer vaccine’s protection from infection against Omicron variant wanes after just 30 days and by 60 to 90 days has a negative efficacy for 76% of study participants.