Mastering Micro Ch.21 – Flashcards
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All of the following are protective factors of the skin and its secretions EXCEPT
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pyocyanin production
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Which region of the skin supports the largest bacterial population?
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Armpits
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An eight-year-old girl has scabs and pus-filled vesicles on her face and throat. Three weeks earlier she had visited her grandmother, who had shingles. What infection does the eight-year-old have?
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Chickenpox
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All of the following are characteristic of Pseudomonas aeruginosa EXCEPT
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gram-negative cell wall
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Kopek spots are a diagnostic indicator of
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measles
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Thrush and vaginitis are caused by
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Candida albicans
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All of the following are characteristic of the Group A beta-hemolytic streptococci EXCEPT a. the ability to dissolve blood clots. b. M proteins. c. the ability to damage cell membranes. d. hyaluronidase production. e. methicillin resistance.
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Methicillin resistance
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Exfoliative toxins are responsible for
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Scalded skin syndrome
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The eradication of smallpox was possible because
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There are no animal reservoirs of the virus
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What leads to toxemia, a sudden drop in BP, TSST-1, and scalded skin syndrome?
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Staphylococcal infection
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The patient has a papular rash. Microscopic examination of skin scrapings reveals small eight-legged animals. The etiology is
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Sarcoptes
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The patient has vesicles and scabs over her forehead. Microscopic examination of skin scrapings shows gram-positive cocci in clusters. The etiology is
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Staphylococcus aureus
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A 35-year-old woman has a red, raised rash on the inside of her thighs. Gram-stained skin scrapings show large budding cells with pseudohyphae. The infection is caused by
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Candida albicans
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Which of the following is likely to spread MRSA among athletes?
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Shared equipment, whirlpool baths, physical contact, and taping gels
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T/F? The majority of the staphylococci isolated from human skin are coagulase-positive.
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False
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T/F? The abbreviation GAS refers to pathogenic strains of Staphylococcus.
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False
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T/F? Candidiasis often occurs following antibiotic therapy for bacterial infections.
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True
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Newborns' eyes are treated with an antibiotic...
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as a routine precaution
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T/F? Acanthamoeba infections are usually transmitted via insects.
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False
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You have a culture of bacteria that you suspect is either Staphylococcus aureus or Streptococcus pyogenes. Is there any morphological difference between the two?
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Yes. S. aureus tends to grow in clusters, whereas S. pyogenes tends to grow in chains.
