December 9, 2021, 3:29 pm Pfizer booster cuts Covid deaths 90% in people over 50 Israeli study determines that a third dose five months after the initial two Pfizer doses reduces risk of death from the disease dramatically. By Abigail Klein Leichman
November 1, 2021, 1:28 pm Israeli data shows Pfizer booster 93% effective Study is first to estimate effectiveness of a third dose of an mRNA Covid-19 vaccine against severe outcomes and within subgroups. By Abigail Klein Leichman
October 25, 2021, 7:00 am Pfizer jab 90% effective in preventing adolescent Covid-19 Israeli study also shows 93% effectiveness in preventing the spread of symptomatic infection within seven to 21 days of the second Pfizer dose. By Jon Schiller
January 14, 2021, 9:25 am Israeli HMOs: Pfizer vaccine immunity best after 14 days Study of 800,000 Covid test takers, half inoculated with the first dose and half not, shows no difference in infection rate until two weeks later. By Abigail Klein Leichman
