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The nation’s 19 million children under 5 are the only group not yet eligible for vaccination against the coronavirus. Many parents have been pushing for an expansion of shots to toddlers and preschoolers, especially as the omicron wave sent record numbers of youngsters to the hospital.

The findings released Tuesday are preliminary and have not been peer-reviewed — the gold standard in scientific research — but they line up with other early data about omicron's behavior, including that it seems to be more easily transmitted.