Unit 2 Flashcards
The next identification test performed on a clinical isolate of a gram cocci that is catalase-positive would most likely be the:
a. penicillin test.
b. PYR test.
c. oxidase test.
d. coagulase test.
coagulase test.
A beta-hemolytic, yellow, creamy, catalase positive, gram-positive cocci is coagulase-negative by the slide coagulase test. Which of the following is most appropriate action in identification of this organism?
a. Report a coagulase-negative Staphylococcus.
b. Report a coagulase-negative Staphylococcus aureus.
c. Reconfirm the hemolytic reaction on a fresh 24-hour culture.
d. Perform a tube coagulase test to confirm the slide test.
Explain your selection
Perform a tube coagulase test to confirm the slide test.
S. aureus has all of the characteristics above but is not coagulase negative. Coagulase negative staphylococci are also not beta-hemolytic. Further testing needs to be done.
Which organism is resistant to Novobiocin?
a. Staphylococcus epidermidis
b. Staphylococcus hominis
c. Staphylococcus saprophyticus
d. All of the above
Staphylococcus saprophyticus
Which of the following media does not contain a sulfur source as an H2S indicator?
a. MacConkey Agar
b. Hektoen agar
c. Salmonella/shigella agar
d. Xylose lysine deoxycholate (XLD) agar
MacConkey Agar
The organism resistant to novobiocin that is primarily isolated from a female patient is a recognized cause of:
a. Impetigo
b. Toxic shock syndrome
c. Urinary tract infection
d. Folliculitis
Urinary tract infection
A non-hemolytic, catalase negative, GPC is PYR positive. You should expect the isolate to be?
a. Bile esculin positive
b. Salt tolerant
c. Susceptible to Optochin
d. Both a and b
Both a and b
Streptococcus pneumonia can be differentiated best from the viridans groups of Streptococci by:
a. The type of hemolysis
b. PYR
c. Bile esculin test
d. Bile solubility
Bile solubility
A gram-positive cocci isolated from a blood culture has the following characteristics: Optochin: Resistant Bacitracin: Resistant Bile esculin hydrolysis: negative Hippurate hydrolysis: positive Catalase: negative This organism is most likely: a. Staphylococcus aureus
b. Streptococcus pneumoniae
c. Streptococcus pyogenes (Group A)
d. Streptococcus agalactiae (Group B)
Streptococcus agalactiae (Group B)
A gamma-hemolytic streptococcus gives the following reactions: Bile esculin = black; Optochin = growth up to the disk, growth in 6.5% NaCl. The CLT should:
a. Report the isolate as Enterococcus
b. Report the isolate as non-enterococcus group D strep
c. Report the isolate as Strep bovis
d. Perform a bacitracin test
Report the isolate as Enterococcus
The bacterial species that can be described as soluble in bile, alpha hemolytic, a major cause of bacterial meningitis, and can have an antiphagocytic capsule is:
a. PYR positive
b. Susceptible to Optochin
c. Resistant to Optochin
d. Viridans strep
Susceptible to Optochin
The organism that is a common cause of Community acquired pneumonia is:
a. S. agalactiae
b. S. pyogenes
c. Enterococcus
d. S. pneumoniae
S. pneumoniae
development of acute glomerulonephritis may be encountered by patients infected with a bacteria that is:
a. Gamma hemolytic, PYR positive
b. Alpha hemolytic, susceptible to optochin
c. Beta hemolytic, susceptible to bacitracin
d. Beta hemolytic, resistant to bacitracin
Beta hemolytic, susceptible to bacitracin
A K/A reaction on TSI indicates that the organism is:
a. glucose fermenter; lactose fermenter
b. glucose fermenter; lactose non-fermenter
c. glucose non-fermenter; lactose fermenter
d. glucose non-fermenter; lactose non-fermenter
glucose fermenter; lactose non-fermenter
The K antigen of the Enterobacteriacede is:
a. heat labile
b. the somatic antigen
c. located on the flagellum
d. the antigen used to group Salmonella
heat labile
Which of the following bacteria are etiologic agents of foodborne gastroenteritis in the United States?
a. Shigella species
b. Salmonella species
c. Yersinia enterocolitica
d. Escherichia coli 0157:H7
e. All of the above are correct
All of the above are correct
