| Haber: |
Five undervaccinated clusters put the entire United States at risk
A new data analysis identifies clusters of unvaccinated people, most of them in the southern United States, that are vulnerable to surges in Covid-19 cases and could become breeding grounds for even more deadly Covid-19 variants.
https://www.cnn.com/2021/07/08/health/undervaccinated-clusters-covid-risk/index.html
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