Covid-19: Hong Kong tests travelers’ saliva to thwart spread of coronavirus

A traveler wearing a protective suit walks with luggage through the arrivals hall of Hong Kong International Airport (HKG) in Hong Kong, China. In the global battle to curb Covid-19, governments have collected troves of data from testing and contact-tracing apps to try to find the disease and stop its spread. Even as many are willing to surrender personal information amid the crisis, privacy experts worry about who controls the data and what will happen to it after the crisis ends. — Bloomberg

Layla Keith had just gotten off a flight from Singapore when she and her fellow passengers were met at the gate by Hong Kong government officials and ushered onto buses that shuttled them to a nearby convention center.

There, they were handed forms to fill out and given small containers to spit into.