How to avoid or prevent bacterial conjunctivitis, if the bacterias that cause it, is present in our skin flora or nasal flora? and how rare is it?

Wash hands: Most germs are acquired from your environment from what you touch and transferred to your oral/nasal membranes the same way.Germs (viral or bacterial) that trigger pinkeye follow this route.Studies show an average adult touches their face/nose about 6X/hr mostly without realizing it.Once on your fingers or nasal membranes they are easily passed to the eyes.Either directly or up the tear ducts.