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Latest COVID update July 20: Record high doses of Pfizer expected
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Chart: pfizer losing efficacy faster against delta variant
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Cdc green-lights pfizer's lower-dose covid-19 vaccine for kids ages 5 to 11
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Covid-19: More than 30m people in UK receive first jab - BBC News
Chart: How Many Covid-19 Vaccine Doses Has The U.S. Secured? | Statista
CDC green-lights Pfizer's lower-dose COVID-19 vaccine for kids ages 5 to 11
Pfizer vaccine: Single dose ‘90 per cent effective after 21 days' - BBC
Canada to purchase additional 20 million doses of Pfizer COVID-19
Latest COVID update May 20: 63,180 Pfizer vaccine doses arrive as age
Pfizer will only ship HALF its planned 100m covid vaccine doses by year
COVID | Biomechanics in the Wild
'Care needed' after getting Covid vaccine - BBC News