With the BA.2 subvariant on the rise, what's safe and what's not? A medical expert explains.
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With the BA.2 subvariant on the rise, what's safe and what's not? A medical expert explains
As the United States navigates a third year of the Covid-19 pandemic, cases are rising modestly in the Northeast, Philadelphia has reinstituted an indoor mask mandate and some colleges are requiring masks during the final days of the spring semester.
