COVID-19 deaths and cases in the US have climbed back to where they were over the winter, wiping out months of progress and potentially bolstering President Joe Biden's argument for sweeping new vaccination requirements.The cases — driven by the Delta variant combined with resistance among some Americans to getting vaccinated — are concentrated mostly in the South.While one-time hot spots like Florida and Louisiana are improving, infection rates are soaring in Kentucky, Georgia and Tennessee, fuelled by children now back in school, loose mask restrictions and low vaccination levels.
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