Some airlines and public transit dropped mask mandates following a federal judge's ruling06:06

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Masks are no longer required on many major airlines and at some U.S. airports. Amtrak, Uber, and some public transit systems have also dropped mask requirements.

These changes come after a federal judge on Monday struck down the Center for Disease Control and Prevention's mask mandate.

Here & Now's Scott Tong talks with Saskia Popescu, epidemiologist and infectious disease expert at George Mason University, about the risks of taking public transit while COVID-19 infections are on the rise again.