As a matter of fact, the dry air outside in the winter is less conducive to spreading disease.
Yes, outside, but more people are inside during the winter months where it is cold. That and dusty and or moldy heating ducts can exasperate asthma and other conditions and cause bronchitis and wintertime allergies which I understand may make one more susceptible to catching a virus.
But I do think that perhaps another reason people get sick as the weather turns cold it that the period right before Thanksgiving and up until New Years, people are busy, sometimes stretched too thin in getting ready for Christmas and the lack of sleep, schlepping in and out of stores, some folks very busy at work this time of year or working an extra seasonal job, their immune system suffers.
I spent Christmas Day at my niece’s house and she and her husband were by then completely exhausted. Their kids were happy though.
