Modern aircraft have quite a good level of filtration, in part because of problems (and lawsuits?) in the past over norovirus. Airports are another matter, especially with all the bunching up at the gates (security) and exits (customs/immigration). The real disease problem though is the ability of people to travel easily from one part of the world to another. Here in Norway, for example, they’ve tracked much of the nation’s outbreak to a couple of nightclubs in one Tyrolean ski resort popular among affluent Norwegians.
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