WASHINGTON: The Pfizer Covid-19 vaccine has proven 94% effective in a study involving 1.2 million people in Israel, the first peer-reviewed real-world research confirming the power of mass immunisation campaigns to bring the pandemic to a close.
Lead author Noam Barda, head of epidemiology and research at the Clalit Research Institute, told AFP the matching process was highly robust. The efficacy against symptomatic infections was 57% between 14-20 days after the first dose, but rose to 94% seven days after the second dosePeople who received second doses were also highly protected against hospitalisation and deaththough the precise numbers here are less significant and had a wider statistical range because of the relatively lower number of cases.
That’s because the participants weren’t being systematically tested at regular intervals; rather, they were getting a test when they wanted one.
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