COVID Vaccine Efficacy
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Delta variant weakens protection from Pfizer, AstraZeneca COVID-19 vaccines: studyThose who get infected after two shots of the Pfizer-BioNTech or AstraZeneca vaccine may be of greater risk to others than under previous variants of COVID-19, U.K. study showsHealthAug 18, 2021
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COVID-19 vaccine protection likely to dim over time: U.K. advisersScientists said it might be expected that COVID-19 vaccine effectiveness would remain high for severe disease but effectiveness against mild disease could fall off over time.HealthJul 30, 2021
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Canada facing the start of a Delta-driven 4th wave, top doctors warnThe news comes on the heels of an upward trend in cases across Canada which, if vaccine uptake doesn't increase, could eventually exceed healthcare system capacity.CanadaJul 30, 2021
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