Watching and waiting, always lurking around the next corner, these three pathogens are both found everywhere and highly resistant, a 1-2 punch for vulnerable patients. They reside in the environment as well as on our bodies, some of them in mucous membranes. These membranes are perfect homes for bacteria: Moist, warm, and often dark. So while they survive for long periods of time without resources, with access to an environment with little competition they will quickly reproduce and become dangerous, especially if they find a way into our bodies. Keep an eye over your shoulder for these ninja pathogens.