Lab technician Prometric exam2022

Lab technician Prometric exam2022

Question:1

What is the source of infection for the patient in the above question?

Options:


(A) Aerosolized spores from soil

(B) Aerosols from contaminated water

(C) Colonization of the upper airways

(D) Inapparent carrier of the organism

Question:2

Vaccination against which bacterial species has been most successful at reducing the number of cases of invasive diseases, including meningitis?

Options:

(A) Escherichia coli K1

(B) Haemophilusinfiuenzae b

(C) Listeria monocytogenes

(D) Neisseria meningitidis

Question:3

A 56-year-old renal transplant patient was hospitalized following an abrupt onset of high fever (39.6 °C), confusion, headache, diarrhea, a cough productive of scant sputum, and shortness of breath. His chemistry profile revealed hyponatremia. A chest radiograph showed lobar infiltrates. Gram stain ofsputum showed numerous neutrophils but failed to show any organisms. A urine antigen test was positive for the causative agent. What is the major virulence factor of the causative agent?

Options:

(A) Antiphagocytic capsule

(B) Cord factor

(C) Exotoxin production

(D) Intracellular growth

Question:4

Which virulence factor is most important when considering the pathology of this case?

Options:

(A) Toxin (lecithinase)

(B) Enterotoxin

(C) Pyocyanin

(D) Pyrogenic exotoxin A



Question:5

A patient injured herself at home in the garden, and after several days, the resulting skin lesion became infected and intensely painful and she sought medical help. Culture of the wound grew Gram-positive cocci that were b-hemolytic on blood agar. On nutrient agar, the organism produced effervescence when hydrogen peroxide was added to the colonies (shown in the photograph). What is the enzyme responsible for this bubbling?

Options:

(A) lactamase

(B) Catalase

(C) Coagulase

(D) Staphylokinase

Question:6

Of the following organisms, what is the patient most likely infected with

Options:

(A) Enterococcus

(B) Group A Streptococcus

(C) Meningococcus

(D) Methicillin-resistant Staphylococcus aureus (MRSA)

 dha exam

Question:7

Based on these initial findings, what is the best antibiotic choice for the patient in the above case

Options:

(A) Amoxicillin/clavulanate

(B) Cephalexin

(C) Dicloxacillin

(D) Polymyxin B

(E) Trimethoprim–sulfamethoxazole (TMP–SMZ)

Question:8

A pediatric patient with a persistent cough is evaluated for sinopulmonary disease. History and physical examination determines that the child suffers from nasal polyps and, possibly, chronic airway obstruction. A sputum sample produces several bacterial species, including Haemophilus infiuenzae and a mucoid variety of Pseudomonas aeruginosa. Which of the following is the most likely diagnosis?

Options:

(A) Bronchiolitis

(B) Chronic obstructive pulmonary disease (COPD)

(C) Cystic fibrosis

(D) Interstitial pneumonia

Question:9

With regard to the above case, which laboratory results would be most useful in confirming the clini- cal diagnosis?

Options:


(A) Intracytoplasmic inclusions in McCoy tissue culture cells

(B) Positive bacterial growth on selective and differential media

(C) Twofold increase in a Weil–Felix Proteus OX-19 titer

(D) Type-specific latex agglutination antibody titer of 1:64

Question:10

The preschool in the above case only serves pasteurized milk and packaged cookies to the children and epidemiologists quickly rule out a food source as the risk factor. With this in mind, which of the following is the most plausible means by which the children were infected?

Options:

(A) Contagioustransmission from an infected child

(B) Drinking water of the preschool is contaminated with the microbe

(C) Failure to wash hands after visiting a petting zoo

(D) Fecal–oral transmission, most likely from the restroom

Answer:

1. (B) Aerosols from contaminated water

2. (B) Haemophilusinfiuenzae b

3. (D) Intracellular growth

4. (A) Toxin (lecithinase)


5. (B) Catalase

6. (D) Methicillin-resistant Staphylococcus aureus (MRSA)


7. (E) Trimethoprim–sulfamethoxazole (TMP–SMZ)

8. (C) Cystic fibrosis

9. (D) Type-specific latex agglutination antibody titer of 1:64

10. (C) Failure to wash hands after visiting a petting zoo

 



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