A fourth dose of the BioNTech/Pfizer vaccine is largely ineffective in stopping Omicron infections despite boosting antibodies, an Israeli hospital study showed.
Healthcare workers at the Sheba Medical Center who received a fourth dose of the vaccine continued to get infected even though blood tests showed an increase in two key kinds of antibodies, according to professor Gili Regev-Yochay who led the research.
The preliminary findings, which are yet to be published, add to the global debate about the effectiveness of repeat doses of the Covid vaccine after booster shots, as concerns grow that regular shots are unsustainable in the long term.
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