Pfizer-BioNTech and the Delta Variant: How Useful Is a Third Dose of Vaccine?

Many countries are moving forward with plans to give vaccinated people a third dose in order to combat the highly infectious Delta variant of the coronavirus. But criticism is mounting, given that only 15 percent of humanity has been fully immunized.

from DER SPIEGEL - International https://ift.tt/3iqWSfT
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