What happened in Arizona? A public health expert explains his state's virus surge

In the U.S., some states that reopened their economies early are now reversing course as the virus surges back, sickening thousands and filling hospitals to capacity. Arizona's governor has ordered gyms, bars and other businesses to close again after reopening them in the middle of May. William Brangham talks to Will Humble, executive director of the Arizona Public Health Association.

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