Thanks for the write-up, I'm surprised they even bothered with 12 days. Did you learn anything worthwhile?
That's a great way to get sick. Even when we were in Afghanistan, everyone tried at least washing "the essentials" as often as possible. And if we had access to a shower, everyone took full advantage of it. I can't speak for the Taiwanese military, but every American Marine learns essential/basic hygiene and commonly spread illnesses within their first few weeks at boot camp.
It's easy to get sick living in close quarters, especially with dozens of other people. That's why we were forced to do a thorough weekly clean, bleaching the floors, polishing everything metal, and a few poor fellows had to scrub the solidified piss from the big trench urinal. It's an attempt to minimize sickness.