As Americans let down their guard and the Delta coronavirus variant spreads, communities around the US are bringing back public-health measures like mask mandates and watching hospitals again fill with COVID-19 patients amid a new wave of cases.
Though the COVID-19 vaccines are highly effective at protecting against severe illness and transmission, including against virus variants, insufficient vaccination allows pockets of high transmission to persist and spread, endangering the health of those unvaccinated and immunocompromised.
The above excerpt was originally published in Business Insider.
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