3 Beneficial Bacteria

STAPHYLOCOCCUS EPIDERMIDIS : This bacteria is beneficial because it's the bacteria that provides the first line of defense on the skin that protects it from other harmful bacteria. This bacteria is a skin-colonizing bacterium that has been proven to not cause any diseases but instead to have known to maintain a commonly benign relationship with its host.

http://www.livestrong.com/article/355815-list-of-beneficial-bacteria-for-humans/

LACTOBACILLI : This bacteria is one of the important beneficial bacteria that can be found mainly in the small intestines. This bacteria is also found in the vagina, and they are a mojor part of the lactic acid bacteria group. Lactic acid allows the environment in the vagina acidic protecting harmful bacteria from growing and multiplying.

http://en.wikipedia.org/wiki/Lactobacillus

VIRIDANS STREPTOCOCCUS : This bacteria is beneficial because of it's ability to protect the body from harmful bacteria that try to get into the mouth and throat. It has access to the heart & bloodstream, and is also known to stay in the body for life because it's the main microbial flora for the throat/mouth.

http://www.livestrong.com/article/355815-list-of-beneficial-bacteria-for-humans/