The ballooning death toll has defied the hopes of many Americans that the less severe Omicron variant would spare the United States the pain of past waves. Deaths have now surpassed the worst days of the autumn surge of the Delta variant, and are more than two-thirds as high as the record tolls of last winter, when vaccines were largely unavailable.

With American lawmakers desperate to turn the page on the pandemic, as some European leaders have already begun to, the number of dead has clouded a sense of optimism, even as Omicron cases recede. And it has laid bare weaknesses in the country’s response, scientists said.

“Death rates are so high in the States — eye-wateringly high,” said Devi Sridhar, head of the global public health program at the University of Edinburgh in Scotland, who has supported loosening coronavirus rules in parts of Britain. “The United States is lagging.”

Some of the reasons for America’s difficulties are well known. Despite having one of the world’s most powerful arsenals of vaccines, the country has failed to vaccinate as […]

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