A nurse sanitizes a patient's arm before administering a Covid-19 vaccine booster during a Pfizer-BioNTech vaccination clinic in Southfield, Michigan, on September 29.
Mandatory Credit: Emily Elconin/Reuters
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Booster shots could soon be recommended for people as young as 40, source says
Booster protection in the US could soon expand to a much broader population, as a source says the US government likely will soon recommend them to people as young as 40 who received either Moderna or Pfizer's Covid-19 vaccine.
