Microbiology Testing Trivia Questions

1. The most likely causative organism in community-acquired UTI is:

Klebsiella species

Proteus mirabilis

E. coli

Staph saprophyticus

2. A 36-year-old afebrile woman with no health problems presents with dysuria and frequency of urination. Her urinalysis findings include results positive for nitrites and leukocyte esterase. You evaluate these results and consider that she likely has:

Purulent vulvovaginitis

A gram-negative UTI

Cystitis caused by Staph saprophyticus

Urethral syndrome

3. Which of the following is a gram-negative diplococcus?

Strep. pneumoniae

Neisseria meningitidis

Staph aureus

H. influenzae

4. The primary mechanism of antimicrobial resistance of H. influenzae is through the organism's

Beta-lactamase production

Hypertrophy of cell membrane

Alteration in protein-binding sites

Failure of DNA gyrase reversal

5. A Tzanck smear that is positive for giant multinucleated cells was taken from a lesion caused by:

Herpes virus

S. aureus

Streptococci

Allergic reaction

6. The most common causative organism in ABRS is:

M. pneumoniae

S. pneumoniae

M. catarrhalis

H. influenzae

7. The likely causative organism of nonbullous impetigo in a 6-year-old include:

H. influenzae and S. pneumoniae

Group A strep and S. aureus

M. catarrhalis and select viruses

P. aeruginosa and select fungi

8. Which of the following organisms is not gram-negative?

E. coli

K. pneumoniae

P. mirabilis

S. saprophyticus

9. The most common causative organisms in cellulitis are:

E. coli and H. influenzae

Bacteroides species and other anaerobes

Group A beta-hemolytic streptococci and S. aureus

Pathogenic viruses

10. Clindamycin is most effective against which of the following organisms?

S. pneumonia

H. influenzae

M. catarrhalis

Adenovirus

11. Which of the following is an oral antimicrobial option for the treatment of a commonly acquired MRSA cutaneous lesion?

Amoxicillin

Dicloxacillin

Cephalexin

Trimethoprim-sulfamethoxazole

12. Which of the following pathogens is often implicated in a COPD exacerbation caused by bacterial respiratory tract infection?

Legionella species

Strep. pyogenes

H. influenzae

Staph aureus

13. Incubation period for S. pyogenes is usually:

1-3 days

3-5 days

6-9 days

10-13 days

14. Which of the following is a characteristic of S. pneumoniae?

Mechanism of antimicrobial resistance primarily through the production of beta-lactamase

Mechanism of antimicrobial resistance primarily through altered protein-binding sites held within the microbe's cell.

Organisms most commonly isolated from mucoid middle ear effusion

Gram-negative organisms

15. The spectrumof antimicrobial activity of mupirocin (Bactroban) includes:

Primarily gram-negative organisms

Select gram-positive organisms

Pseudomonas species and anaerobic organisms

Only organisms that do not produce beta-lactamase

16. With regard to pharyngitis caused by group C streptococci, the NP considers that:

Potential complications include glomerulonephritis

Appropriate antimicrobial therapy helps to facilitate more rapid resolution of symptoms

Infection with these organisms carries a significant risk of subsequent rheumatic fever

Acute infectious hepatitis can occur if not treated with an appropriate antimicrobial.

17. An organism often associated with COPD exacerbation in a person with advanced disease and repeated exacerbations is:

Pseudomonas aeruginosa

Chlamydophila pneumoniae

Strep pneumoniae

H. influenzae

18. The mechanism of resistance of DRSP is through the cell's

Beta-lactamase production

Hypertrophy of cell membrane

Alteration in protein-binding sites

Failure of DNA gyrase reversal

19. Which of the following is a characteristic of H. influenzae?

Newer macrolides are ineffective against the organism

Its antimicrobial resistance results from altered protein-binding sites within the wall of the bacteria

Some isolates exhibit antimicrobial resistance via production of beta-lactamase

This is a gram-positive organism

20. Characteristics of M. catarrhalis include:

High rate of beta-lactamase production

Antimicrobial resistance resulting from altered protein-binding sites

Often being found in middle ear exudate in recurrent otitis media

Gram-positive organisms

21. The most sensitive and specific test for H. pylori infection from the following list is:

Stool Gram stain, looking for the offending organism

Serological testing for antigen related to the infection

Organism-specific stool antigen testing

Fecal DNA testing

22. A man presents with otitis externa. The likely causative pathogens include all of the following except:

Fungal agents

P. aeruginosa

S. aureus

M. catarrhalis

23. The likely causative organism in AOM include:

Certain gram-positive and gram-negative bacteria

Gram-negative bacteria and pathogenic viruses

Rhinovirus and S. aureus

Predominantly beta-lactamase-producing organisms

24. Which of the following WBC forms is an ominous finding in the presence of severe bacterial infection?

Neutrophil

Lymphocyte

Basophil

Metamyelocyte

25. The notation of alkaline urine in a patient with a UTI may point to infection caused by:

Klebsiella species

P. mirabilis

E.coli

S. Saprophyticus