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Effect of Dry Air on the Spread of Flu
The dry air has an effect on the spread of the virus. Firstly, our mucous membranes work less well if it is colder. This is the first defense line of our body when a virus enters. Due to the dry air,the mucous membranes dry out,making it more arduous for our body to keep the intruders. The virus particles also absorb more water in damp air.This makes them heavier and sink down, so that they stay in the air for less long and spread it.
Less Sun
Another reason is the lack of vitamin D and sunlight.In the winter the days are shorter and the sun is less powerful, which makes a shortage of vitamin D larger. This vitamin, which your body produces by exposure to sunlight, plays a role in our immune system. In the event of a lack of vitamin D, your body has more difficulty adjusting the different immune reactions.
Even though cold in itself does not lead directly to disease, the cold, dry and dark winter days ensure ideal circumstances in which the flu virus can spread.Poor ventilation, dry air and a reduced defense contribute to the annual peak of flu cases in the winter. So it is indeed not so much the cold that makes people sick, but rather the circumstances that accompany it.
Bron: IRVM en National Geographic
