Pfizer asks U.S. to approve a 4th dose for seniors, cited waning effectiveness - Printable Version
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Pfizer asks U.S. to approve a 4th dose for seniors, cited waning effectiveness - theold - 16-03-2022
In the U.S. so far, a fourth dose is recommended only for people with severely weakened immune systems, who need three doses to begin with for the best chance at any protection.
https://www.pbs.org/newshour/health/pfizer-asks-u-s-to-approve-a-4th-covid-vaccine-dose-for-seniors