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The atmospheric conditions best suited to grow streptococci and enterococci are:


A) Room air
B) Oxygen-free atmosphere
C) High carbon dioxide concentration
D) Low carbon dioxide concentration

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What test is used as a presumptive identification of Streptococcus pneumoniae?


A) Optochin
B) Bacitracin
C) PYR
D) Hippurate hydrolysis

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Which of the following is the drug of choice for treating most streptococcal infections?


A) Erythromycin
B) Cephalothin
C) Penicillin
D) Gentamicin

Correct Answer

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What is the drug of choice to treat group A streptococci when the patient cannot tolerate penicillin?


A) Penicillin
B) Erythromycin
C) Gentamicin
D) Cefoxitin

Correct Answer

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Two serious complications of an infection with group A streptococcal disease are:


A) Toxic shock syndrome and scarlet fever
B) Gangrene and rheumatic fever
C) Acute glomerulonephritis and necrotizing fasciitis
D) Acute glomerulonephritis and rheumatic fever

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Physiologic classification of streptococci divide the species into all the following groups EXCEPT:


A) Pyogenic streptococci
B) Lactococci
C) b-Hemolytic streptococci
D) Enterococci

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What causes the red spreading rash in scarlet fever?


A) Hyaluronidase
B) Streptolysin O
C) Streptococcal pyrogenic exotoxins
D) Streptolysin S

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What is the cellular structure that Streptococcus pyogenes relies on for its virulence?


A) Peptidoglycan
B) Lipopolysaccharide
C) S antigens
D) M proteins

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Streptococcus agalactiae is a significant cause of?


A) Pharyngitis
B) Cystitis
C) Invasive disease of the newborn
D) Vaginitis

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Most doctors' offices use the rapid throat swab methods to identify Streptococcus pyogenes.If the test is positive,the physician treats the patient.What should happen if the test is negative?


A) The physician should treat the patient to be safe.
B) The physician should perform a throat culture.
C) The physician should repeat the rapid strep tests.
D) None of the above.

Correct Answer

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What is the drug of choice to treat Streptococcus pneumoniae?


A) Erythromycin
B) Penicillin
C) Zithromax
D) Chloramphenicol

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What organism on sheep blood agar (SBA) has colonies that are small and transparent,surrounded by a wide zone of b-hemolysis?


A) Streptococcus agalactiae
B) Streptococcus pyogenes
C) Enterococcus
D) Viridans strep

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Why do Streptococcus pneumoniae colonies on sheep blood agar (SBA) appear like a coin-raised edges and a depressed center?


A) The older growth at the center is smaller due to lack of nutrients.
B) The newer growths on the outside of the colony undergo the Quellung reaction.
C) The older growth at the center is killed due to autolysis.
D) The newer growth has a thicker capsule, therefore it appears raised.

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What organism on sheep blood agar (SBA) has grayish white colonies surrounded by a small zone of b-hemolysis?


A) Viridans strep
B) Enterococcus
C) Streptococcus pyogenes
D) Streptococcus agalactiae

Correct Answer

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What disease is produced by group A streptococci that is characterized by a rapidly progressing inflammation and necrosis of the skin,subcutaneous fat,and fascia?


A) Erysipelas
B) Scarlet fever
C) Necrotizing fasciitis
D) Streptococcal toxic shock syndrome

Correct Answer

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What two tests have been mainstays in identification schemes for the non-b-hemolytic,catalase-negative,gram-positive cocci?


A) Bacitracin and PYR
B) Hippurate hydrolysis and Optochin
C) Nitrate and PYR
D) Bile esculin and salt tolerance

Correct Answer

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What test can be used to differentiate S.agalactiae from other b-hemolytic streptococci?


A) Bacitracin
B) Hippurate hydrolysis
C) PYR
D) Optochin

Correct Answer

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