Lab Technician Prometric 2022

Lab Technician Prometric 2022

Question:1

A bacterium, cultured on MacConkey agar (shown in the photograph), was isolated from sputum and blood of the patient in the above case. What is the primary function of the pathogenicity determinant depicted in this photo?

Options:

(A) Antiphagocytic, unless opsonization occurs

(B) Degrades secretory IgA on mucosal surfaces

(C) Inhibits the function of complement

(D) Lyses neutrophils and macrophages

Answer:

(A) Antiphagocytic, unless opsonization occurs

 

Question:2

A bacterium was isolated from the central nervous sys- tem of a newborn that died of meningitis. The vagina of the mother was colonized with the same isolate as determined by the capsular antigen. The microbe grew well on standard blood and MacConkey agar at ambi- ent atmospheric conditions. What is the most likely etiologic agent?

Options:

(A) Escherichia coli K1

(B) Group B Streptococcus type III capsule

(C) Haemophilus infiuenzae type b

(D) Neisseria meningitidis serogroup b

 Answer:

(A) Escherichia coli K1

 


Question:3

An adult tourist visiting a remote area of Guatemala developed fever, prostration, malaise, dysentery, and dehydration. Based on current epidemiologic data of the region, a local physician reported that the causative agent was probably a diarrheogenic strain of Escherichia coli and did not prescribe antibiotic therapy. Presuming the Guatemalan doctor to be correct, which type of viru- lent E. coli is most consistent with this clinical picture?

Options:

(A) Enteroaggregative E. coli (EAEC)

(B) Enterohemorrhagic E. coli (EHEC)

(C) Enteroinvasive E. coli (EIEC)

(D) Enteropathogenic E. coli (EPEC)

(E) Enterotoxigenic E. coli (ETEC)

 Answer:

(E) Enterotoxigenic E. coli (ETEC)

 

Question:4

A 40-year-old man presented with a rubeola-like rash on the extremities, chills, fever, myalgia, and malaise 5 days after returning from a June fishing trip in Arkansas. A history of tick bites is noted and Rocky Mountain spotted fever (RMSF) is suspected. What is the etiologic agent of this disease?

Options:

(A) Babesia microti

(B) Orientia tsutsugamushi

(C) Rickettsia prowazeki

(D) Rickettsia rickettsii

 Answer:

(D) Rickettsia rickettsii

 dha exam

Question:5

With reference to the above question, which antimi- crobial agent should be employed?

Options:

(A) Chloramphenicol

(B) Ciprofloxacin

(C) Doxycycline

(D) Penicillin G

 Answer:

(C) Doxycycline

 

Question:6

A previously healthy woman became nauseated and vomits 12 hours after eating home-pickled eggs. Within 24 hours, she developed a diffuse flaccid paralysis and respiratory impairment, necessitating hospitalization and mechanical ventilation. Other symptoms included diplopia and dysarthria. What is the most likely diagnosis?

Options:

(A) Botulism

(B) Brucellosis

(C) Gastrointestinal anthrax

(D) Legionellosis

(E) Meningococcal disease

 Answer:

(A) Botulism

 

Question:7

A 52-year-old woman presented with indigestion and heartburn occurring shortly after meals which she treated with over-the-counter antacids. Physical examination revealed mild epigastric tenderness. A radiolabeled-urea breath test is positive. What is the most probable etiologic agent?

Options:

(A) Campylobacter jejuni

(B) Clostridium difficile

(C) Helicobacter pylori

(D) Shigella dysenteriae

Answer:

(C) Helicobacter pylori

 

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Question:8

What cancer is the patient in the above case at risk for as a consequence of this infection?

Options:

(A) Pancreatic cancer

(B) Gastric adenocarcinoma
 
(C) Hepatoma
 
(D) Colon cancer

 Answer:

(B) Gastric adenocarcinoma

 

Question:9

What virulence factor of the organism may be associ- ated with induction of this cancer?

Options:

(A) cagA

(B) Heat shock protein B

(C) Mucinase

(D) Urease

 Answer:

(A) cagA

 

Question:10

Hemorrhagic colitis, hemolytic uremic syndrome, and thrombotic thrombocytopenic purpura are clinical manifestations of which bacterial species?

Options:

(A) Campylobacter jejuni

(B) Escherichia coli O157:H7

(C) Shigella fiexneri

(D) Vibrio cholera

 Answer:

(B) Escherichia coli O157:H7


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