Pfizer Says Third Dose Of Vaccine ‘Strongly’ Boosts Protection Against The Delta Variant

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CNN reports A third dose of the Pfizer/BioNTech COVID-19 vaccine can “strongly” boost protection against the Delta variant — beyond the protection afforded by the standard two doses, suggests new data released by Pfizer on Wednesday, July 28, 2021.

The data posted online, which are expected to be discussed in a company earnings call on Wednesday morning, suggest that antibody levels against the Delta variant in people ages 18 to 55 who receive a third dose of vaccine are greater than five-fold than following a second dose.

Pfizer data suggest third dose of Covid-19 vaccine ‘strongly’ boosts protection against Delta variant
Syringes wand vials of the Pfizer-BioNTech Covid-19 vaccine are prepared to be administered to front-line health care workers at a drive up vaccination site in Reno, Nevada in 2020.

Among people ages 65 to 85, the Pfizer data suggest that antibody levels against the Delta variant after receiving a third dose of vaccine are greater than 11-fold than following a second dose.

There’s an “estimated potential for up to 100-fold increase in Delta neutralization post-dose three compared to pre-dose three,” researchers wrote in the Pfizer data slides.

The data have not yet been peer-reviewed or published.

The data also show that antibody levels are much higher after a third dose than a second dose against the original coronavirus variant and the Beta variant, first identified in South Africa.

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