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Still a lot unknown about contagious BA.2 variant, health officials still urge caution


FILE - A person wearing a face masks to protect against the spread of the coronavirus walks in Philadelphia, Feb. 16, 2022. (AP Photo/Matt Rourke, FILE)
FILE - A person wearing a face masks to protect against the spread of the coronavirus walks in Philadelphia, Feb. 16, 2022. (AP Photo/Matt Rourke, FILE)
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