The Pfizer-BioNTech Covid vaccine is 90% effective at preventing hospitalisation for up to six months, with no signs of waning during that time period, according to a large new US study conducted by researchers at Pfizer and Kaiser Permanente. The vaccine also provides powerful protection against the highly contagious Delta variant, the scientists found.from World News Headlines, Latest International News, World Breaking News - Times of India https://ift.tt/3BhF79R
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