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Dry air might boost flu transmission

Germs prefer an environment that’s cool, dry and UV-free

For flu germs, warm muggy weather is simply too close for comfort. It saps their vigor, cutting the period in which they remain infectious, according to a pair of new studies.

Although it remains a mystery why flu viruses are so sensitive to heat and humidity, both papers highlight conditions that can aid and abet infection — factors that might be thwarted by controlling aspects of the indoor environment.

One laboratory study measured how long highly pathogenic avian influenza remains infectious. Scientists applied known quantities of virus to a variety of surfaces that might be found outdoors on a chicken farm. Poultry have been implicated as a source of this particularly deadly type of bird flu.

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