@meso @creamqueen @Mummabear @Zennblack @raintrees I think people get sick during the winter because they all gather together inside with the doors and windows closed. Their sneezes and coughs and farts just hang in the air when they keep it closed-up like that.

My grandma used to take "air baths" in the winter. We'd all put on coats and sweaters and she'd turn off the heater and open all the doors and windows for a half-hour or so, then close everything back up and put the heater on. My mom used to think my grandma was crazy and that she'd catch pneumonia, but now I think my grandma was right.

I also replace the heater filter after everyone has been sick. I think heater and air conditioner filters can cause a lot of problems; more likely allergies, but potentially viruses and bacteria too, so there's that.