There's no universal digital passport yet, it's not clear exactly what kind of proof will be accepted, and paper vaccination cards can be easily forged, damaged or lost.
An analysis by NPR finds many nations are tossing aside international health regulations and imposing strict travel restrictions. Experts say the benefits are likely to be small.
Companies are canceling employee travel and airlines are slashing hundreds of flights amid fear of the spreading coronavirus. The slump is hitting the travel industry and related businesses hard.
U.S. border agents improperly look for broad evidence of crimes when they search international travelers' phones and laptops without probable cause, civil rights groups argue.
NPR's Islamabad correspondent faced a thorny problem when she moved from Jerusalem to Pakistan: how to transport her pet between countries that lack diplomatic links and don't recognize each other.
