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Melbourne — Israel, with the highest proportion of citizens vaccinated against Covid-19 in the world, found it took three weeks for the Pfizer-BioNTech shot to start curbing new cases and hospitalisations.

Researchers in the Middle Eastern country reported preliminary observations on Wednesday from a national immunisation programme that began on December 20. Improvement in the number of new cases and hospitalised patients occurred 21 days following the vaccination campaign, the scientists said, noting that the real-life effect of vaccines may take longer than was demonstrated in clinical trials...

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