The panel endorsed targeting a variant of the coronavirus that is now receding, though some officials suggested aiming at newer versions of the virus that have emerged in recent weeks.
Studies have shown that protection against serious illness from Covid-19 tends to improve as the vaccines more precisely target dominant strains, according to the Food and Drug Administration.
The Food and Drug Administration said regulators had examined 201 commercial dairy samples, including milk, cottage cheese and sour cream, and had so far not found evidence that potentially infectious virus was on grocery shelves.
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