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Pfizer Vaccine Shot Provides Partial Omicron Shield in Early Study

Omicron evades immunity induced by Pfizer Inc.’s shot better than other Covid-19 variants, according to laboratory experiments that indicate a booster shot could help stop the highly mutated strain.

In the first reported experiments gauging the effectiveness of Pfizer and BioNTech SE’s vaccine, researchers at the African Health Research Institute found omicron infection results in about a 40-fold reduction in virus-blocking antibodies compared with the strain detected in China almost two years ago. The loss of immune protection is “robust, but not complete, said Alex Sigal, head of research at the Durban-based laboratory, in an online presentation late Tuesday.