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.
A patient receives a booster shot in Israel.

A patient receives a booster shot in Israel.

Foto: Sebastian Scheiner / AP
DER SPIEGEL 32/2021
SPIEGEL International
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