結果 : why has covid lasted so long

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1:25

VERIFY: How long does COVID-19 last on various surfaces?

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How long does COVID vaccine immunity last? | DW News

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How long does COVID immunity last? | Coronavirus news from ABC7

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COVID, Immunity probably long lasting

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Covid 19 symptoms: Signs and treatment of mystery long covid's long-lasting effects

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Coronavirus (COVID-19): How Long Does the Coronavirus Last on Surfaces?

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WHO establishes clinical definition of long COVID |Latest World English News |WION

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