An advisory panel of the US Food and Drug Administration (FDA) has endorsed booster jabs of Johnson & Johnson’s COVID-19 vaccine amid concerns the J&J single-dose jab is less effective than previously thought.The FDA’s influential 19-member advisory panel voted unanimously on Friday to recommend a second jab for about 15 million people in the United States who have received a first dose of the J&J vaccine.A day earlier, the panel recommended a third dose of Moderna’s two-dose vaccine, and it previously endorsed boosters of the Pfizer-BioNTech jab.
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