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並前往https://theconversation.com/why-is-delta-such-a-worry-its-more-infectious-probably-causes-more-severe-disease-and-challenges-our-vaccines-163579

Why is Delta such a worry? It's more infectious, probably ...

It's more infectious, probably causes more severe disease, and challenges our vaccines. July 5, 2021 4.09pm EDT. Michael Toole, Burnet Institute ...

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