The Flu Virus Thrives In Low And Very High Humidity

A Virginia Tech professor and her team figured out why the flu spreads in the winter: indoor heating. When the outside air is heated, it becomes very dry, creating the perfect environment for the virus. Their tests show that the influenza virus performs best at humidity levels under 50%, which is pretty much every heated space in the winter. Above that humidity, it doesn’t do very well until the levels reach 98%. That humidity is seen in tropical environments in the summer wet season, which is another condition under which flu outbreaks happen. The moral of the story: use humidifiers in the winter to reduce the spread of the flu.

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From The Wall Street Journal, via Slashdot

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