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Micro - G+ Cocci

Stack #79347

QuestionAnswer
Staphylococcus found in and on skin; clusters;
Staphylococcus aureus - causes rash, pimples, bed sores, sinusitis, pnemonia, ear infection
Staphylococcus aureus - virulence factor resists phagocytosis; lipase & proteinase; leukocedin: destroys pmns and platlets; makes alpha, beta, gamma, and delta toxins: destroys RBCs and causes beta hemolysis; DNAase; coagulase: plasma forms clot on org.; makes enterotoxins
WBCs = leukocytes neutrophils = pmns; monocytes = macrophage; basophils; eosinophils; lymphocytes
hemolysis - effect on RBCs alpha - partial lysis; beta - complete lysis; gamma - no effect
Staphylococcus aureus - identifying labs coagulase +; beta hemolysis on blood agar; catalase +
Streptococcus clusters and pairs; types: alpha, beta, gamma; groups: A-M (all beta)
Streptococcus pyogenes (Group A, type beta) - causes tonsilitis; meningitis; flesh eating; ear infection
Streptococcus pyogenes (Group A, type beta) - VF Erythrogenic toxin; DPNase - destroys pmns; DNAase; streptokinase - lysis blood clots; amylase - breaksdown starch; has capsule
Streptococcus pyogenes (Group A, type beta) - ID bacitracin test: place disk on blood agar, org. not grow around disk (90%); antibody agglutination: mix antibody with org. on slide, + = clusters group together, - = mixture stays cloudy (100%)
Streptococcus pneumoniae beta hemolytic; flora - oral, ears, sinuses, eyes; lancet shaped in pairs; can make a capsule; stickyness causes pneumonia
Group B, type beta: Strep normal in female vaginal tract = no harm; baby can pick it up through birth = harm
Group D Streptococcus sausage-like shape; can look like all three hemolytic types; resistant to antibiotics; changed genus -> ENTEROCOCCUS; normal in gut flora; ID: catalse does not produce oxygen
Created by: lcnelson
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