Another mRNA booster or not?

A fourth mRNA dose has been underway in Israel for a few months now. The U.K. recently started a fourth dose for people over 75 years old and coined it “spring boosters.” In Germany, those over 70 years old are eligible for a fourth shot of the mRNA series.

In the U.S., Pfizer announced they were seeking an EUA for a fourth dosage for people 65 years or…