Microbiology and Immunology 3820A Lecture Notes - Lecture 9: Endocarditis, Carditis, Chronic Obstructive Pulmonary Disease
4 Mar 2016
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Streptococcus spp. (dr. colby) lecture 3 - aerobic gram positive cocci: Do not utilize oxygen (no cytochromes to use oxygen) but are aerotolerant (not anaerobes). Distinguished from staph by colonial morphology (small, transluscent colonies often hemolytic) and by lack of catalase enzyme. By hemolytic reaction (alpha hemolytic (incomplete hemolysis), beta (completely), alpha prime (tiny complete hemolysis sounded by incomplete), gama (non- hemolytic) By lancefield grouping (serotyping of c carbohydrate from cell wall a, b, c ) By phenotypic characteristics (biochemical tests) Can name them by their actual name. Strepto pyogenes: pyogenes virulence factors chains of gram positive cocci, artificially coloured. Lacefield group a group a strep (gas) don"t say that. Capsule made of hyaluronic acid resist phagocytosis. Fimbriae: m protein (virulence proportional to level) stick to our cells and make the virulent. Streptolysins o and s people get post- strep diseases, do an aost to see if they have streptolusis.
