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11 Cards in this Set
- Front
- Back
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List the genera in the family Micrococcaceae
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Micrococcus, Planococcus, Staphylococcus, Stomatococcus.
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Discuss the epidemiology of infection with the Staphylococci
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Usually normal flora, found on skin and mucosal surfaces. Infections result when a normally sterile site experiences trauma or an abrasion to the skin. Many times, the trauma that allows entrance is so minor most people don’t even notice it.
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Describe the pathogenicity of and the types of infection caused by S. aureus
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Can be life threatening if not treated. Most common are folliculitis, furuncles, carbuncles, and bullous impetigo. Poses a threat for deeper tissue invasion, bacteremia, and spread to internal organs.
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Describe the virulence factors associated with S. aureus.
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Capsule formation, hemolysins, Staphylococcal protein A, cell wall constituents, toxins, enzymes.
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Describe the pathogenicity of coagulase negative Staphylococci:
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Less virulent than s. aureus, usually opportunistic pathogens,nosocomial pathogens
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Describe the pathogenicity of coagulase negative Micrococci and Stomatococci:
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epresent contamination from skin, mucous membranes or environment. Act like opportunistic pathogens in rare cases
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Describe the pathogenicity of coagulase negative Planococci
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live in marine environments, have not been implicated in human infections.
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Discuss the methods available for identification and differentiation of catalase positive Gram positive cocci and the reactions of each.
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Direct microscopic exam: gram stain. Culture: all micrococcaceae grow well in broths(thioglycollate, trypticase soy broth, brain heart infusion), grow well on SBA, MSA, CAN, and PEA. DO NOT grow on MacConkey. Catalase test, glucose fermentation, lysostaphin susceptibility, bacitracin susceptibility, modified oxidase test, coagulase test(test tube and slide), DNase test, novobiacin susceptibility.
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Discuss antimicrobial therapy for the catalase positive Gram positive cocci.
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Becoming increasingly more resistant to antimicrobial treatment. MRSA, VRSA, clindamycin resistant,
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regular, non-spore forming bacilli
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Erysipelothrix sp
Gardnerella sp Lactobacillus sp Listeria sp Kurthia sp Gordona sp |
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Spore forming bacilli
spore-forming under aerobic environment |
Bacillus anthracis
Bacillus cereus |
