IMED2001 Lecture Notes - Lecture 7: Staphylococcus Saprophyticus, Staphylococcus Lugdunensis, Gram Staining
26 Mar 2020
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Three important genera: staphylococcus, streptococcus, enterococcus, used to be a streptococcus organism, but are constantly being classified (as we are always redefining relationships) 3 important human pathogens: staphylococcus aureus (positive in the coagulase test, staphylococcus epidermeris (negative in the coagulase test, staphylococcus saprophyticus (negative in the coagulase test) Coagulase negative staphylococci found on humans: s. epidermidis, s. haemolyticus, s. saprophyticus, s. lugdunensis, s. capitius, s. caprae, s. chromogenes, s. cohnii, s. equorum, s. lentus, s. pasteuri, s. schleiferi, s. sciuri, s. simulans, s. warneri, s. xylosis. All look the same on the gram stain positive purple-blue, cocci, and arrangement are in grape-like clusters. Only identified to species level when isolated from sterile site . 20-40% of the population are carriers of this especially in the nose, anterior nares. However those who don"t can have frequent, chronic skin infections such as: folliculitis, boils, minor wound infections. Serious, pyogenic infections in any organ, skin or soft tissue: pus forming, abscess.
