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U.S. grapples with whether to modify COVID vaccine for fall

Moderna and Pfizer have tested updated shots against the super-contagious Omicron variant, and advisers to the Food and Drug Administration will debate Tuesday if it's time to make a switch — setting the stage for similar moves by other countries.

Deborah Sampson, left, a nurse at a University of Washington Medical Center clinic in Seattle, gives a Pfizer COVID-19 vaccine shot to a 20-month-old child on June 21, 2022 in Seattle. COVID-19 shots for children between six months and five years of age were recently given federal authorization. (AP Photo/Ted S. Warren)

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