This is not for everyone. I can do this and enjoy it in summer but not winter. I have poor circulation and am always cold as it is. In winter, the water comes out of our pipes at whatever ground temperature is - typically just a couple degrees above freezing. Tried it once for a week, and was stepping out of the shower nearly hypothermic and shivering violently. Immediately came down with a massive head and chest col…
I can't figure out which makes less sense scientifically, that a cold shower somehow made you ill or that antibiotics cured a viral infection. Probably placebo in the latter case and happenstance in the first. You would have gotten sick and gotten better anyway without either the shower or the anti-biotics.
So next time you do this experiment you need to take anti-biotics in a cold shower.