Thread by @ariehkovler

Researchers from Israel's Clalit HMO, led by @RanBalicer, find Pfizer Covid vaccine reduces symptomatic disease by 94% and serious disease by 92%.

@RanBalicer The research included 600k vaccinated people aged 16 and up, of whom 170k were over 60.

@RanBalicer Each vaccinated person was 'paired' with a unvaccinated person with a similar age, health and risk profile, creating a control group of 600k and a vaccinated group of 600k.

@RanBalicer The Clalit researchers calculated the reduction in serious disease to be 92%, but with a range of 91-99%. More precise data will become available as more time passes from vaccination.

@RanBalicer Another piece of good news: the effectiveness of the Pfizer vaccine at preventing symptomatic and serious illness was consistent across age groups, including over-70s

This was reported in @ynetalerts in Hebrew: ynet.co.il/news/article/r…