Covid 19 One Dose or Two IV

Angrybearblog December 22,2020 “Eyeballing, the first shot looks 80-90% effective.” (Moderna) and “my guess is that the first shot was about 90% effective over this period.” (Pfizer).

Angrybearblog December 24,2020

New England Journal of Medicine February 17 2021

We used documents submitted to the Food and Drug Administration² to derive the vaccine efficacy beginning from 2 weeks after the first dose to before the second dose (Table 1). Even before the second dose, BNT162b2 was highly efficacious, with a vaccine efficacy of 92.6%, a finding similar to the first-dose efficacy of 92.1% reported for the mRNA-1273 vaccine (Moderna).³

With such a highly protective first dose, the benefits derived from a scarce supply of vaccine could be maximized by deferring second doses until all priority group members are offered at least one dose.

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