If you throw seeds on concrete, they won't grow. They have to meet fertile soil. So it is with germs. Even if they do get into your body, unless it is nice and acidic, they can't grow and multiply and make you sick - or kill you.
Robert O. Young, Shelley Redford Young (2008). “The pH Miracle: Balance Your Diet, Reclaim Your Health”, p.28, Hachette UK
