If shared laundry were a significant vector of transmissible diseases, it would be pretty damn obvious.
Can fungus grow in your washer? Sure. My washing machine growing up as a kid was gross and my clothes constantly stunk because of my family's inability to take wet laundry out of the washer. Then I went away to college, the machines were maintained, I'm not a moron and can handle getting clothes out of the washer when they're done, and my clothes no longer stunk.
Wash your clothes with detergent (no, you don't even need hot water), dry them promptly, and you will be fine. Use a hot air dryer instead of line drying if you're really worried.
After hanging the laundry outside, won't you need to wash it again? Most countries have things birds, rodents, and pollen.
Do you always have dry non-freezing weather? If the humidity stays high, the clothes will get moldy before they dry. If the temperature is low, you'll get ice in your clothes. There may even be rain.
I had to read all of 4 sentences to see that this does not say that air dryers are growing bacteria. In fact it says the opposite, that there was very little bacteria in the nozzles. There is bacteria in the air and the dryers are sucking it in and pushing it onto hands being dried.
And the smell of tumble drying. I live in an apartment complex and the smell coming out of the dryer vents is overwhelming. It's not intrinsic; there would barely be any odor at all if people gave up dryer sheets and fabric softener, but it seems like many have never heard anything so outlandish as that.
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