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The flu virus tends to spread and infect in the winter. There is no doubt about that.
Yes, because people spend more time cooped up together indoors, with their windows and doors closed.

So in the winter people spend more time in close proximity to others who are infected, in environments with less air circulation. (Modern building techniques call for super-insulated tightly sealed buildings. This cuts energy expenditures, but also reduces air circulation.)

One of the sources of Legionnaires' Disease, which is a form of bacterial pneumonia, is air conditioning ducts.

Or maybe not. While that was certainly an oft-cited explanation, there is some debate about whether or not it was spread through the ducts. See here, for example:'s_disease#Philadelphia.2C_1976

And for this bacteria, I'm confident you're wrong about temperature:
Legionellosis is an infection caused by the genus of Gram negative bacteria Legionella... a ubiquitous aquatic organism that thrives in warm environments (25 to 45° C with an optimum around 35° C)...

Note that the optimum temperature is 35°C, quite close to the average body temperature of 37°C.

I tried searching for information on other bacteria & viruses, but couldn't find any information about the temperatures at which they thrive.

Also, see this message:
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