As edman007 pointed out; it is due to the proximity of other people, rather than an effect of the temperature on the body. In worse weather, more people use public transport more and spend time in shopping Malls for example. Socialising would also tend to be indoors.
Also, cold weather irritates the mucus membranes, giving us the typical ‘sniffy’ nose when out in the cold.
The big one with cold temperature and being sick is what you do with your day. When it’s warm you have a BBQ or go for a hike, or the beach, etc, they are all outside, and usually fairly socially distantanced.
When it’s cold you watch TV, play video games, or throw an indoor party, where you’re usually in a room with terrible ventilation and packed so close to each other you are literally touching your guests.
Social distancing matters a lot for disease transmission, and it’s super easy to do on a nice day outside and super hard on a cold day inside.
Cold environment caused organism metabolism to slow down. Theoretically, cold environment would cause slower infection. Maybe because your metabolism slowed down too, you felt more tired and felt the fatigue and ” sickness “. But it should not cause a sickness by infection unless the sickness is caused by the cold itself
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