Pharmaceutical giant Pfizer has asked health regulators in the United States to authorise booster jabs of its COVID-19 vaccine for everyone aged 18 and older, amid concerns that coronavirus infections could rise again in the coming winter months in the US.Older Americans and those more vulnerable to infections are already eligible for a third booster jab in the US.On Tuesday, Pfizer-BioNTech asked the US Food and Drug Administration (FDA) to make all adults in the country eligible.
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