Pfizer to seek FDA authorization for third, booster dose of its Covid-19 vaccine

Pfizer is about to seek U.S. authorization for a third dose of its Covid-19 vaccine, saying Thursday that another shot within 12 months could dramatically boost immunity and maybe help ward off the latest worrisome coronavirus mutant.

Research from multiple countries shows the Pfizer shot and other widely used Covid-19 vaccines offer strong protection against the highly contagious Delta variant, which is spreading rapidly around the world and now accounts for most new U.S. infections.

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