This appears to be a very new finding. I seem to remember earlier studies suggesting single doses of Moderna/Pfizer were between ~53-70% effective. The number 5

This appears to be a very new finding. I seem to remember earlier studies suggesting single doses of Moderna/Pfizer were between ~53-70% effective. The number 53 sticks out in my memory for some reason. Could be misremembering though. Edit: Looks like the earlier results I was thinking of say 52% effectiveness from 1 dose, but that included people who were infected very shortly after the first dose. > Using the data from the published study of the Pfizer vaccine, Public Health England determined that vaccine efficacy was 89% for 15-21 days after dose 1 – and before dose 2 on day 21. The range was between 52% and 97%. Source: https://globalbiodefense.com/2021/03/20/how-effective-is-the-first-shot-of-the-pfizer-or-moderna-vaccine/ https://globalbiodefense.com/2021/03/20/how-effective-is-the...