Masks effect hard to isolate, but officials say they're important layer of protection

Data collected from a handful of states where the idea of mask wearing has spread and been adopted, shows that after three weeks' time, the average daily growth rate of COVID-19 cases decreases. Although experts say that mask-wearing is not a solution on its own, the benefits of government mandates to wear a mask do still make an impact and the effectiveness only increases over time.

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