Trouble is the incubation period and the timing of infectiousness vary. So a person could spread a disease before their symptoms begin and after their symptoms subside depending on the infection.Originally Posted by Stylesjl
Also, a surface contaminated by an organism will stay infectious for varing amounts of time from minutes to weeks depending on the organism.
Not very many people stay away from work nor keep their kids out of daycare nor school when outbreaks of the usual diseases are severe. Even when a person is ill they don't even always stay home.
If sick people stayed home more often and everybody washed their hands a lot more we could see a decrease in some infections.
This is not correct. Pathogenic, (disease causing), organisms have specific places they live, survive, and multiply. These organisms don't get 'weaker' nor 'stronger' except by genetic changes. Your immune system might stop a disease from making you sick, but when another person gets an infectious dose, their illness is a new infection. Unless the organism has undergone a genetic change, the next person's illness will depend on their immune system which research tells us is not significantly impacted by weather.Originally Posted by Stylesjl
You are sort of correct but not for the reasons you site. Closer more concentrated exposure of people to other people is only one way out of many that infectious diseases increase in a population.Originally Posted by Stylesjl
But as to why we see an increase in upper respiratory infections in the winter weather, it is the most important reason for cyclic increases at that time of year. The weather's direct impact on your body has not been shown to have an impact in study after study.