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Natural immunity isn't enough for a COVID passport. Should it be?

National Post: It’s not clear what population level of “natural immunity” we might already have. Canada has recorded nearly 1.6 million COVID infections. “We’re definitely missing some infections — there is no doubt that some of the mild cases out there are not getting caught,” Russell said. “We might indeed be closer to 90 per cent if we rope those who were actually infected into the herd immunity calculation. The problem is knowing which ones to include.”

Natural immunity > vaccination.

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