Here’s how coronavirus spreads on a plane—and the safest place to sit

Global travel opens new roads for outbreaks, like coronavirus and the flu—but which is more dangerous, and how can you stay safe?

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Passengers who flew from the Chinese city of Wuhan, the epicenter of a pneumonia-causing new coronavirus, go through quarantine at Narita airport near Tokyo on Jan. 23, 2020. Seen in the foreground is a thermographic monitor set up to check their body temperatures.

When an outbreak strikes, it is natural to become leery of hopping on an airplane. It is even more alarming when two serious viruses are circulating at once.

The world is gripped by a new coronavirus that started in China and has since movedinto more than 85 countries, including the United States. Meanwhile, it is also flu season, which so far has caused 18,000 deaths in the U.S.

Major airports have begun screening passengers for the coronavirus, and more than three dozen airlines—including Delta, American, and United—have cut their flights to China and other places affected by the crisis. But those measures may not provide much solace to anyone who has to board a flight.

After all, you can avoid the person who is sneezing in line at Cinnabon, but you’re more or less left to fate once you’ve strapped on that seatbelt inside a flying metal canister.

While there is still much to learn about the Wuhan outbreak, scientists do know a bit about similar coronaviruses and other respiratory illnesses like influenza. So how do those viruses spread—and specifically...

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