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Skin flora, also called skin microbiota, refers to microbiota (communities of microorganisms) that reside on the skin, typically human skin. Many of them are bacteria of which there are around 1,000 species upon human skin from nineteen phyla. [1] [2] Most are found in the superficial layers of the epidermis and the upper parts of hair follicles.
[4] [5] Fusobacterium was discovered in 1900 by Courmont and Cade and is common in the flora of humans. [6] [7] Strains of Fusobacterium can cause several human diseases and infections, including periodontal diseases, Lemierre's syndrome, [8] oral, head, and neck infections, as well as colorectal cancer and topical skin ulcers. [9]
Anaerobic bacteria are a common cause of infections, some of which can be serious and life-threatening. Because anaerobes are the predominant components of the normal flora of the skin and mucous membranes, they are a common cause of infections of endogenous origin. [4]
Commensal S. epidermidis is an essential part of a healthy skin microbiota. It contributes through supporting a healthy skin barrier, healing cuts of the skin, protecting the skin microbiota from colonization of skin pathogens, and acting as an immune system modulator. [7] Staphylococcus epidermidis biofilm on titanium substrate
By contrast, several thousand species are part of the gut flora present in the digestive tract. [citation needed] The body is continually exposed to many species of bacteria, including beneficial commensals, which grow on the skin and mucous membranes, and saprophytes, which grow mainly in the soil and in decaying matter. The blood and tissue ...
Staphylococcus capitis is a bacterium that colonizes the skin, scalp, face and neck. [2] Staphylococcus capitis typically colonises the skin of the head (especially the ears and forehead), arms, and, sometimes, legs. According to one study, head and arm populations of S. capitis persisted over the course of one year in 20% of individuals.
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It is part of the skin flora of humans, [3] and its largest populations are usually found at the axillae, perineum, and inguinal areas. [4] S. haemolyticus also colonizes primates and domestic animals. [4] It is a well-known opportunistic pathogen, and is the second-most frequently isolated CoNS (S. epidermidis is the first). [5]