By Ahmed Aboulenein and Michael Erman WASHINGTON (Reuters) – Americans are lining up for booster doses of COVID-19 vaccines at a record pace, with concerns about the newly-detected Omicron coronavirus variant spurring millions to get shots, the U.S. government said on Tuesday. Just under a million people a day received booster doses of one of the three authorized vaccines last week, the highest rate since U.S. regulators gave the nod to additional shots for some adults in September, government data shows. “In the last week, we’ve gotten nearly 7 million people a booster; that’s a million boost…

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