The Centers for Disease Control and Prevention's mixed messaging on travel reveals the uncertain future of the pandemic, Dr. Monica Gandhi tells NPR. Gandhi is an infectious disease expert at the University of California San Francisco.

In the future, some travelers may be required to verify their vaccine status to enter a stadium or attend a wedding. Dr. Zeke Emanuel, a professor of medical ethics at the University of Pennsylvania and former member of President Biden's Transition COVID-19 Advisory Board, tells NPR so-called vaccine "passports" can be made secure and private.

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