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.
Several lawmakers questioned whether the company had become so large — with tentacles in every aspect of the nation’s medical care — that the effects of the hack were outsize.
Andrew Witty, the chief executive of UnitedHealth Group, acknowledged before the Senate Finance Committee that hackers had found a weakness in its cybersecurity that forced the shutdown of a vast billing and payments system.
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