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[Slashdot] - Pfizer Data Suggest Third Dose of Covid-19 Vaccine 'Strongly' Boosts Protection Against Delta Variant


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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. From a report: The data posted online suggest that antibody levels against the Delta variant in people ages 18 to 55 who receive a third dose of vaccine are greater than fivefold than following a second dose. 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. The data, which included 23 people, have not yet been peer-reviewed or published. During a company earnings call on Wednesday morning, Dr. Mikael Dolsten, who leads worldwide research, development and medical for Pfizer, called the new data on a third dose of vaccine "encouraging." "Receiving a third dose more than six months after vaccination, when protection may be beginning to wane, was estimated to potentially boost the neutralizing antibody titers in participants in this study to up to 100 times higher post-dose three compared to pre-dose three," Dolsten said in prepared remarks. "These preliminary data are very encouraging as Delta continues to spread." The data also show that antibody levels are much higher against the original coronavirus variant and the Beta variant, first identified in South Africa, after a third dose.

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