Question 1

A patient presents with a wound on their leg after being scratched by a tree branch. The wound is red, swollen, and warm to the touch. Which of the following is the most likely diagnosis?

Accepted Answer

Cellulitis

Question 2

Which of the following statements best describes the difference between RT-PCR and antigen tests for viral infections?

Accepted Answer

RT-PCR detects viral RNA and is more sensitive than antigen tests.

Question 3

A laboratory technician is performing a coagulase test. What is the primary purpose of this biochemical test?

Accepted Answer

To differentiate Staphylococcus aureus from other staphylococci.

Question 4

A patient’s antibody titer is reported as 1:256. What does this indicate about their immune response?

Accepted Answer

They have a high concentration of antibodies and a strong immune response.

Question 5

Which of the following best describes a macule?

Accepted Answer

A flat, discolored spot on the skin.

Question 6

A child presents with a 'slapped cheek' rash. Which disease is most likely responsible?

Accepted Answer

Fifth disease (erythema infectiosum)

Question 7

Which of the following is a key feature of spotted fever rickettsioses?

Accepted Answer

Rash begins on the wrists and ankles.

Question 8

A patient is diagnosed with meningitis. Which of the following symptoms is most characteristic of this condition?

Accepted Answer

Neck stiffness and photophobia

Question 9

Which of the following best describes the transmission of Ebola virus disease?

Accepted Answer

Bodily fluids

Question 10

A laboratory is using a microarray to analyze a patient sample. What is the primary advantage of this technique?

Accepted Answer

It allows simultaneous detection of multiple genes or pathogens.

Question 11

A patient with a history of cat exposure develops lymph node swelling and fever. Which disease is most likely?

Accepted Answer

Cat scratch disease

Question 12

Which of the following is the correct definition of viremia?

Accepted Answer

Presence of viruses in the blood

Question 13

A patient presents with a unilateral facial rash that follows a single dermatome. Which disease is most likely?

Accepted Answer

Shingles (herpes zoster)

Question 14

Which of the following best describes the principle of serotyping?

Accepted Answer

Classifying microorganisms based on their surface antigens

Question 15

A patient is suspected of having brucellosis. Which of the following is the most likely source of infection?

Accepted Answer

Consumption of unpasteurized dairy products

Question 16

Which of the following best describes the difference between bacteremia and septicemia?

Accepted Answer

Bacteremia is the presence of bacteria in the blood, while septicemia is a systemic inflammatory response to infection in the blood.

Question 17

A 'clean catch' urine sample is collected to diagnose a urinary tract infection. Which of the following best explains the purpose of this method?

Accepted Answer

To reduce contamination from skin flora

Question 18

Which of the following is a key characteristic of antibodies used in immunologic testing?

Accepted Answer

They are specific to a single epitope.

Question 19

A patient is diagnosed with infectious mononucleosis. Which of the following is the most common causative agent?

Accepted Answer

Epstein-Barr virus

Question 20

A laboratory is using PCR to detect a pathogen. Which of the following best describes the principle of PCR?

Accepted Answer

Amplification of specific DNA sequences

Microbiology Study Guide: Diagnosing Infections and Infectious Diseases of Skin, Eyes, Nervous, Cardiovascular, and Lymphatic Systems

Study Guide - Practice Questions

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