As I understand it the cold is generally bad for viruses and bacteria. It certainly isn’t optimal for reproduction. I know being cold can impact you immune system a bit and people tend to crowd inside when it is cold outside meaning they can spread more easily person to person. Are there other reasons colds seem spread more in the winter than summer?
In: Biology
Partially, it’s, as you identified, that we crowd together more in winter. It’s also thought that colder air has less water-carrying capacity, so the drier air allows airborne diseases (especially flu) to flourish.
Read more: https://www.bbc.com/future/article/20151016-the-real-reason-germs-spread-in-the-winter
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