And then the COVID virus mutated, reducing the efficacy of that specific vaccine variant.
Current real-world data shows latest updated Pfizer-BioNTech COVID-19 vaccines reduce the risk of hospitalization by roughly 50% to 60% and lower the risk of urgent care or emergency department visits by 50% to 75%.
Yale medical regularly updates efficacy data on a roughly six month(? IIRC) cycle, other countries also routinely publish.
> Similar vaccine efficacy (generally 90 to 100%) was observed across subgroups
defined by age, sex, race, ethnicity, baseline body-mass index, and the presence of coexisting conditions.
also my source was i was cognizant during the 2020-2023 years and paying very close attention to every presser. the headlines comport with my memory of the reporting and the timeline of the efficacy decay.
And then the COVID virus mutated, reducing the efficacy of that specific vaccine variant.
Current real-world data shows latest updated Pfizer-BioNTech COVID-19 vaccines reduce the risk of hospitalization by roughly 50% to 60% and lower the risk of urgent care or emergency department visits by 50% to 75%.
Yale medical regularly updates efficacy data on a roughly six month(? IIRC) cycle, other countries also routinely publish.