The US marks a vaccine milestone, but one expert warns that the coronavirus Delta variant has a worrying impact on patients
As President Joe Biden celebrated America’s 300 million vaccine dose milestone Friday, experts warned that the spread of coronavirus variants could spur a surge in troubling new cases if more people don’t get inoculated. Overall, Covid-19 cases, hospitalizations and deaths in the US have declined significantly in recent months. But virus variants, particularly the Delta
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