Bloomberg Law
Dec. 7, 2021, 11:55 PM

Pfizer Shot Provides Partial Omicron Shield in Early Study (2)

Antony Sguazzin
Antony Sguazzin
Bloomberg News

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.

The loss of immune protection is “robust, but not complete,” Alex Sigal, head of research ...

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