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
Cold viruses (typically rhinoviruses) are not seasonal and are actually *less* common during winter months than other times of the year. This is because they’re actually displaced by influenza viruses which are seasonal. Flu viruses are less stable and subject to more environmental considerations for transmission, and overall transmission is greater during these periods due to human behavior, temperature, and humidity.
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