Nope. Def not advocating for masks, sanitizer. Terrain theory is about personal responsibility re: health. Focus should be on an individual person's strength and ability to become a hostile host, not a soft target to microbes. A healthy person (no vitamin/mineral deficiencies, parasite free) isn't gonna be wrecked by virus, bacterial threats. If you research beri beri disease (vitamin B deficiency) note similarities between bad c19 outcomes and chronic B deficient people. "Take your vitamins" is what terrain people mean when they say clean the tank. The tank is you.