Humans are able to detect differences in temperature. In winter, for example, living areas are cosy and warm. Outside, however, we would not be able to stand it without a winter jacket. Humans do not sense whether the air they breathe in or feel on their skin has low or high humidity. Low humidity leads to an increased risk of infection as well as higher survival rates and higher transmission efficiency of influenza viruses due to the drying out of the mucous membranes in the mouth, nose, throat and eyes. Influenza cases during the heating season are thus often caused by low humidity.
