What We Know So Far About Waning Vaccine Effectiveness

> “The main objective of the Covid vaccine is to prevent severe disease and death, and they are still doing a good job at that,” said Melissa Higdon, a faculty member at the Johns Hopkins Bloomberg School of Public Health

Pfizer/BioNTech efficacy trial [1]:

> The first primary end point was the efficacy of BNT162b2 against confirmed Covid-19 with onset at least 7 days after the second dose in participants who had been without serologic or virologic evidence of SARS-CoV-2 infection up to 7 days after the second dose

[1] https://www.nejm.org/doi/pdf/10.1056/NEJMoa2034577?articleTo...