Why can winter worsen the corona pandemic?

The dreaded second corona virus wave has arrived just in time for the beginning of the cold season. Since the start of the pandemic epidemiologists and virologists have been warning us of the effect winter can have, whereby the cold weather outside keeps people in their homes, spreading the virus more and more indoors in closed rooms. For example, after analysing contact tracing, a study by Japanese researchers found that people that people are 19 times more likely to become infected indoors than outdoors.

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