There appears to be a “very large drop” in immunity against the new variant among those given Pfizer’s vaccine, said Alex Sigal, a professor at the Africa Health Research Institute, after his laboratory studied blood samples of 12 people vaccinated with the jab.
But – in results with promising implications for booster jabs – antibodies in samples from those who had been both double vaccinated and naturally infected with coronavirus appeared significantly more effective against the new variant, according to the study, which has not yet been peer-reviewed.
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