PolitiFact | Calculating herd immunity is more than 'simple math'
https://www.politifact.com/factchecks/2021/apr/19/greg-abbott/calculating-herd-immunity-more-simple-math/
https://www.politifact.com/factchecks/2021/apr/19/greg-abbott/calculating-herd-immunity-more-simple-math/
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