Someone who is sniffling opposite you on the train: how do you avoid being sick at Christmas?

The super flu is raging in Europe. And now you are sitting on a train or bus opposite a coughing, sneezing and blowing fellow passenger. Can you prevent yourself from becoming infected and sniffling at your Christmas dinner? Or, even worse, miss out on the festive cheer? Virologist Steven Van Gucht explains what research shows. “Even if you just exhale, you can spread a virus.”

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