Health chiefs are urging all Americans over 50 years old to come forward for their fourth Covid vaccine amid rising cases and hospitalizations, despite some experts warning the shots are not yet needed for the group.Dr Rochelle Walensky, director of the Center for Disease Control and Prevention (,) called on older Americans to 'stay up to date' with their jabs, saying many were last vaccinated 'months ago' on Thursday.Second boosters were approved for older adults at the end of March but, to date, only a quarter have received the additional shot. The CDC is now doubling down on efforts to get more people jabbed for a fourth time.
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