This story back in February reported 'Single Pfizer shot 90 percent effective after 21 days' and that 'vaccine effectiveness was still pretty much zero until ab

This story back in February reported 'Single Pfizer shot 90 percent effective after 21 days' and that 'vaccine effectiveness was still pretty much zero until about 14 days after people were vaccinated. But then after day 14 immunity rose gradually day by day to about 90 percent at day 21....' [https://medicalxpress.com/news/2021-02-pfizer-shot-percent-effective-days.html https://medicalxpress.com/news/2021-02-pfizer-shot-percent-e...] This looks to fit in with that trend ... after 14 days, slowly growing immunity.