After a Sluggish Start, Vaccine Rollout Is Improving in Every StateOn Jan. 1, just a quarter of vaccine doses delivered across the United States had been used, compared to 68 percent of doses on Feb. 11.By Lauren Leatherby and Amy Schoenfeld Walker

After a Sluggish Start, Vaccine Rollout Is Improving in Every StateOn Jan. 1, just a quarter of vaccine doses delivered across the United States had been used, compared to 68 percent of doses on Feb. 11.By Lauren Leatherby and Amy Schoenfeld Walker

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