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With more than 40 million doses of coronavirus vaccines available, U.S. health authorities said they’re confident there will be enough for both qualified older Americans seeking booster shots and the young children for whom initial vaccines are expected to be approved in the not-too-distant future.

The spike in demand — expected following last week’s  â€” would be the first significant jump in months. More than 70 million Americans remain unvaccinated despite the enticement of lottery prizes, free food or gifts and pleas from exhausted health care workers as the  in recent weeks.