A medical worker holds a dose of the Pfizer-BioNTech Covid-19 vaccine on February 12, 2021 at the Tapparelli Retirement Home in Saluzzo, near Cuneo, Italy, during a vaccination campaign for people over 80
The experiment was carried out between December 20 2020 and February 1, 2021 — a period when a newer variant first identified in Britain was rampant in Israel, making the vaccine’s performance all the more impressive.Each vaccinated participant was matched to an unvaccinated “control” person of similar age, sex, geographic, medical and other characteristics.
The researchers then recorded outcomes at days 14-20 after the first of the two doses and day seven or more after the second. The study also found people who received their second dose had a 92 percent lower chance of getting any form of infection at all compared to those who were unvaccinated.
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