Prognosis
Pfizer Outlines Booster Plans While Regulators Signal Caution
- Early human data shows third shot raises antibody levels
- Federal health agencies say no need for boosters at this time
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Pfizer Inc. plans to request U.S. emergency authorization in August for a third booster dose of its Covid-19 vaccine, based on early data showing that it can sharply increase immune protection against the coronavirus.
At the same time, however, federal health officials signaled that they would take a cautious approach to potential booster shots, and underlined that the currently available vaccines are effective at keeping people from being sickened by the coronavirus.