MicroBiology Chapter 14 Quiz

Match the organism with the clinical infections it is associated with. -Pneumonia, meningitis, and otitis media -Bacterial pharyngitis, necrotizing fasciitis, scarlet fever, poststreptococcal glomerulonephritis and rheumatic fever -Urinary tract infections, bacteremia, and intraabdominal infections -Septicemia, pneumonia, and meningitis in newborns

-Streptococcus pneumoniae -Streptococcus pyogenes -Enterococcus sp. -Streptococcus agalactiae

Do Streptococcus pneumoniae and viridans streptococci belong to a Lancefield group? Select one: a. No b. Yes

A. No

Given that both Staphylococcus sp. and Streptococcus sp. are Gram positive cocci, but Staphylococcus sp. are catalase positive and Streptococcus sp. are catalase negative, could you use the catalase test to rapidly distinguish whether a Gram positive coccus is a Staphylococcus sp. or Streptococcus sp.? Select one: a. No b. Yes

B. Yes

Which type of environment enhances β-hemolysis of streptococci? Select one: a. Anaerobic b. Aerobic

a. Anaerobic

Which of the following body sites are normally sterile? (check ALL that apply) Select one or more: a. CSF b. Blood c. Pharynx d. Bone

a. CSF b. Blood d. Bone

Which of the following are common pathogens that fall into the Streptococcus and Enterococcus genera? (check ALL that apply) Select one or more: a. Streptococcus pyogenes b. Streptococcus pneumoniae c. Viridans streptococci d. Enterococcus faecalis e. Enterococcus faecium f. Streptococcus agalactiae

a. Streptococcus pyogenes b. Streptococcus pneumoniae c. Viridans streptococci d. Enterococcus faecalis e. Enterococcus faecium f. Streptococcus agalactiae

Which of the following characteristics are true of Streptococcus sp. and Enterococcus sp.? (check ALL that apply) Select one or more: a. Varying hemolytic patterns b. Small or medium sized colonies c. Gram-negative diplococci d. Catalase negative e. Gram positive cocci

a. Varying hemolytic patterns b. Small or medium sized colonies d. Catalase negative e. Gram positive cocci

Which of the following virulence factors of Streptococcus pyogenes prevent phagocytosis of the organism? (check ALL that apply) Select one or more: a. F protein b. M protein c. Hyaluronic acid capsule d. Hyaluronidase e. Streptokinase

b. M protein c. Hyaluronic acid capsule

Which of the following streptococcal exotoxins are hemolytic? (check ALL that apply) Select one or more: a. SpeC b. SpeA c. Streptolysin S d. Streptolysin O

c. Streptolysin S d. Streptolysin O

Which of these organisms is considered to be a Group A strep? Select one or more: a. Streptococcus pneumoniae b. Enterococcus faecalis c. Viridans streptococci d. Streptococcus pyogenes e. Streptococcus agalactiae f. Enterococcus faecium

d. Streptococcus pyogenes

What is Lancefield classification based on? Select one: a. The type of exotoxins produced by the streptococcus b. The nutritional requirements of the streptococcus c. The type of hemolysis produced by the streptococcus d. The type of carbohydrate present in the cell wall of the streptococcus

d. The type of carbohydrate present in the cell wall of the streptococcus

Which of these organisms is considered to be a Group B strep? Select one or more: a. Enterococcus faecium b. Streptococcus pneumoniae c. Viridans streptococci d. Enterococcus faecalis e. Streptococcus agalactiae f. Streptococcus pyogenes

e. Streptococcus agalactiae