Pfizer COVID-19 vaccine effectiveness drops 6 months after 2nd dose: study - National | Globalnews.ca - discu.eu

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Delta variant 133% more deadly than original COVID strain: Canadian study | Globalnews.ca https://globalnews.ca/news/8244271/delta-variant-covid-19-strain-canadian-study/ 489 comments

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Effectiveness of mRNA BNT162b2 COVID-19 vaccine up to 6 months in a large integrated health system in the USA: a retrospective cohort study - The Lancet https://www.thelancet.com/journals/lancet/article/piis0140-6736(21)02183-8/fulltext 3272 comments

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