Medical Laboratory Technician Exam FREE Medical Laboratory Technician Clinical Microbiology Questions and Answers 2

Question 1

A patient presents with watery diarrhea after recent antibiotic therapy. Which organism is most likely responsible and requires anaerobic culture on selective media?

Accepted Answer

Clostridioides difficile

Answer

Salmonella enteritidis

Answer

Campylobacter jejuni

Answer

Vibrio cholerae

Question 2

Which staining technique is most appropriate for identifying Mycobacterium tuberculosis in a sputum specimen?

Accepted Answer

Ziehl-Neelsen acid-fast stain

Answer

Gram stain

Answer

India ink preparation

Answer

Lactophenol cotton blue

Question 3

A urine culture grows greater than 100,000 CFU/mL of a Gram-negative rod that is lactose-positive on MacConkey agar and indole-positive. What is the most likely identification?

Accepted Answer

Escherichia coli

Answer

Klebsiella pneumoniae

Answer

Proteus mirabilis

Answer

Pseudomonas aeruginosa

Question 4

Which atmospheric condition is required for primary isolation of Campylobacter jejuni from stool specimens?

Accepted Answer

Microaerophilic (5% O2, 10% CO2)

Answer

Strict anaerobic

Answer

Increased CO2 (5-10%) only

Answer

Ambient air at 25 degrees C

Question 5

A throat culture on sheep blood agar shows small translucent colonies surrounded by a clear zone of complete hemolysis. Which Lancefield group is most likely represented?

Accepted Answer

Group A (Streptococcus pyogenes)

Answer

Group B (Streptococcus agalactiae)

Answer

Group D (Enterococcus faecalis)

Answer

Non-groupable (Streptococcus pneumoniae)

Question 6

Which biochemical test differentiates Staphylococcus aureus from coagulase-negative staphylococci?

Accepted Answer

Coagulase test

Answer

Oxidase test

Answer

Catalase test

Answer

Bile esculin test

A patient presents with watery diarrhea after recent antibiotic therapy.Which organism is most likely responsible and requires anaerobic culture on selective media?

A patient presents with watery diarrhea after recent antibiotic therapy.
Which organism is most likely responsible and requires anaerobic culture on selective media?