Infections depend greatly on the electron and proton availability of your terrain (your body tissues), and you can move these values around by selecting different kinds of drinking water and fight the 4 types of infections since they just so happen to be polar opposites in terms of electron/proton requirements (so not at the same time obviously):

https://i.maga.host/psbMuUI.png << this image i made condenses most of everything i stumbled upon regarding this topic (most of which is in French, if you understand it let me know i can dig a few things), it should give you a good idea of what the theory is about.

Drinking water below 100PPM mineral salts has greatly reduced my vulnerability to viral infections, but... it has not completely stopped them.