Pfizer’s Vaccine Protection Decreases Over Time, Not Due to Delta Variant, Study Finds

By showing that waning immunity, and not the Delta variant, was the likely reason for the increase in breakthrough infections, the study suggests that it may not be necessary to reformulate a Pfizer-BioNTech booster that specifically targets this strain. For now, at least, a third injection identical to the first two would likely expand the vaccine’s initial record of protection against all variants, including Delta, Tartof noted.

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