Well. I have been practicing nasal flushing for 50 years. I was hanging around Hippie communities in Gothenburg and they used Hindu "Naso" bottles. It seemed sensible practice at that time.

I have had Common Cold only once ever since. This was because I wanted to read one Knut Hamsun's book and it was not available on Pirate Bay. I did not realize I was quite receptive to a virus on a book.

I also invented the use of some kind of anti-viral agent all on my own. I read about amoebas entering the brain in India, so I started to use a drop of household bleach. But I later resorted to to Betadine-Povidone because you cannot have all sorts of stuff in your backpack.