What is XBB? A new COVID strain is driving cases in two countries and worrying scientists

What is XBB? A new COVID strain is driving cases in two countries and worrying scientists submitted by /u/CEOAerotyneLtd
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source https://www.reddit.com/r/Health/comments/y1vvfw/what_is_xbb_a_new_covid_strain_is_driving_cases/
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