The Food and Drug Administration on Saturday issued an emergency authorization for a Covid-19 vaccine developed by Johnson & Johnson, the third vaccine to be cleared for use in the United States and the first that requires only one dose. The vaccine, which has not yet been tested in children or adolescents, was cleared for use in adults aged 18 and older. On Sunday, the Advisory Committee on Immunization Practices — an expert panel that advises the Centers for Disease Control and Prevention on vaccination policy — urged the CDC to recommend use of the vaccine. CDC Director Rochelle Walensky later signed off on the recommendation, paving the way for the vaccine to be deployed.

 

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