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Pfizer Shot Provides Partial Omicron Shield in Early Study

  • Laboratory head Sigal advocates booster to combat variant
  • Study provides first indication of effectiveness of vaccines
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WATCH: Pfizer’s vaccine provides less immunity to the omicron variant than to other major versions of Covid-19.Source: Bloomberg
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Pfizer Inc.’s vaccine provides less immunity to the omicron variant than to other major versions of Covid-19, according to laboratory experiments that still indicated a third dose may help stop the highly mutated strain.

Researchers at the Africa Health Research Institute in Durban, South Africa, found omicron resulted in about a 40-fold reduction in levels of neutralizing antibodies produced by people who had received two doses of the Pfizer-BioNTech SE shot, compared with the strain detected in China almost two years ago.