MCQs Mock Test for Lab Technicians and Technologists: Chapter 36

Which genetic material is found in pathogenic Corynebacterium diphtheriae but not in nonpathogenic normal flora diphtheroids?

Your patient has subacute bacterial endocarditis caused by a member of the viridans group of streptococci. Which one of the following sites is MOST likely to be the source of the organism?

Sixteen residents in a retirement home have fever, malaise, and anorexia. These residents have taken their meals prepared by the same kitchen. Blood cultures from of these residents grow Salmonella enterica subsp. typhi. The primary reservoir of this organism is

A 22-year-old woman complains of a persistent nonproductive cough and a fever of 101°F that came on slowly over the last 4 days. Physical examination reveals some rales in the left lung base. A patchy infiltrate is seen on chest X-ray. She works as a secretary in a law office and has not traveled recently. She is not immunocompromised and has not been hospitalized recently. A sample of her serum agglutinates red blood cells at 4°C but not at 37°C. Which one of the following BEST describes the organism that is the MOST likely cause of her disease?

A 28-year-old woman with a previous history of rheumatic fever now has a fever for the past 2 weeks. Physical examination reveals a new heart murmur. You suspect endocarditis and do a blood culture, which grows a viridans group streptococcus later identified as Streptococcus sanguis. Of the following body sites, which one is the MOST likely source of this organism?

Each of the following statements concerning infection with Chlamydia psittaci is correct EXCEPT:

A 50-year-old homeless alcoholic has a fever and is coughing up 1 cup of green, foul-smelling sputum per day. You suspect that he may have a lung abscess. Which one of the following pairs of organisms is MOST likely to be the cause?

Mosquitoes is/are the vector in the following disorder(s)

Which one of the following organisms is MOST likely to be the cause of pneumonia in an immunocompetent young adult?

A 22-year-old woman presents with “the worst sore throat I’ve ever had.” She also complains of fatigue and anorexia. She is not immunocompromised and has not been hospitalized recently. On examination, she is febrile to 38°C, the pharynx is inflamed, and there are a few tender cervical nodes bilaterally. There are no white lesions on the tongue or pharynx. A throat culture grows alpha-hemolytic colonies on blood agar that are optochin-resistant. Of the following, which one is the MOST likely cause?

Each of the following statements concerning Pneumocystis carinii is correct EXCEPT:

Each of the following parasites is transmitted by mosquitoes EXCEPT:

Each of the following statements concerning Mycobacterium tuberculosis is correct EXCEPT:

A 55-year-old woman had her rheumatic heart valve replaced with a prosthetic valve. Six blood cultures became positive after 3 days of incubation. An optochin- resistant, catalase-negative gram-positive coccus that was alpha-hemolytic was isolated. What was the most likely causal agent?

The MOST important way the host counteracts the function of the pneumococcal polysaccharide capsule is via:

Black water fever is a special manifestation of malaria caused by;

Listed below are five bacteria paired with a mode of transmission. Which one of the pairings is MOST accurate?

Each of the following statements concerning Toxoplasma gondii is correct EXCEPT:

Each of the following statements concerning Rocky Mountain spotted fever is correct EXCEPT:

Each of the following statements concerning kala-azar is correct EXCEPT:

Father of antiseptic surgery is

After sporozoite gain entrance to human body it undergoes developmental cycle first in liver than in RBC, only after which fever is seen. This incubation period varies between plasmodium species, and ………….. species has longest incubation period.

Which one of the following illnesses is NOT a zoonosis?

A 70-year-old man presents to the emergency department with a fever of 103.5°F, a dry cough, tachypnea, and chest pain. History reveals he has been smoking since he was a teen. He mentions that several people at the assisted living community where he resides have had similar symptoms. A sputum sample isolated organisms that grew on buffered charcoal yeast extract agar and stained weakly gram-negative. Which of the following properties is consistent with the above organism?

Ticks are vectors for the transmission of each of the following diseases EXCEPT:

Which one of the following protozoa primarily infects macrophages?

What organism is most likely responsible for bacterial endocarditis in men following urological instrumentation.

Which one of the following is NOT an important characteristic of Streptococcus pyogenes?

A 24-year-old primiparous woman in her eighth month of gestation develops a positive IgM titer to Toxoplasma gondii for the first time. She should be advised by her physician that

Each of the following statements concerning Trypanosoma cruzi is correct EXCEPT:

Which one of the following statements concerning Legionella pneumophila is CORRECT?

A 14-year-old girl develops a sore throat, fever, and earache of approximately 1 week duration. Upon examination by her physician, an erythematous rash is noted covering most of her body and her tongue appears bright red. Which of the following is the description of the causal agent?

Your patient has a brain abscess that was detected 1 month after a dental extraction. Which one of the following organisms is MOST likely to be involved?

An outbreak of sepsis caused by Staphylococcus aureus has occurred in the newborn nursery. You are called upon to investigate. According to your knowledge of the normal flora, what is the MOST likely source of the organism?

Regarding Lyme disease, which one of the following is MOST accurate?

A 35-year-old man comes to the emergency department complaining of high fever, chills, severe headache, and confusion. He has recently returned from Africa. A peripheral blood smear reveals multiple ring structures and crescent-shaped gametes. Which of the following organisms is the most likely cause?

A 68-year-old woman on chemotherapy for leukemia has developed sepsis due to an infection with Escherichia coli . The following day the patient develops septic shock and dies. The structure on the bacterium most likely responsible for causing septic shock in this patient is

Each of the following statements concerning epidemic typhus is correct EXCEPT:

Which of the following statement(s) regarding Plasmodium falciparum are true?

Which one of the following statements concerning the organisms that cause brucellosis is CORRECT?

A 12-year-old boy from North Carolina presents to the emergency department with rash, fever, and severe headache that began 3 days ago. The rash began on his arms and legs and then spread to the trunk. The pediatrician notes conjunctival redness, and lab tests reveal proteinuria. Which of the following events likely led to the child’s illness?

A 35-year-old captain in the army reserves has been plagued by a painful, erosive lesion near his ear lobe since his return from Operation Desert Storm several years ago. He denies exposure to the toxic by-products of burning oil fields. Punch biopsy of the leading edge of the erosion reveals macrophages distended with oval amastigotes. How was this infection acquired?

A 12-year-old boy presents to his pediatrician with fever, malaise, and a sore throat. Physical examination reveals a fever of 103°F, cervical lymphadenopathy, and pharyngeal erythema. A swab is taken from some of the tonsillar exudate and cultured on blood agar. Culture reveals beta hemolytic, gram-positive cocci, and a rapid antigen test is positive. What is the major component that protects the causal agent from osmotic damage?

A 33-year-old man presents to the emergency department with a fever of 102.5°F, facial palsy, headache, and malaise. A circular maculopapular rash was identified on the patients left shoulder; the patient was unaware of the rash. The patient likely acquired the above infection via which of the following routes?

A 45-year-old man presents to the emergency department with shortness of breath and a productive cough. His sputum was gelatinous and bloody. Gram stain of the sputum revealed numerous PMNs and gram-negative rods. Which of the following descriptions is most likely to fit the patient?

A 45-year-old homeless man presents to the emergency department with fever and night sweats, coughing up blood. Acid-fast bacilli are identified in his sputum. Which of the following virulence factors allows the causal agent to inhibit phagosome-lysosome fusion to survive intracellularly?

Each of the following statements concerning spirochetes is correct EXCEPT:

Which one of the following zoonotic illnesses has NO arthropod vector?

A 81-year-old woman who is receiving chemotherapy for leukemia develops a fever to 40°C and has two episodes of teeth-chattering chills, and her blood pressure drops to 80/20 mmHg. Of the following factors, which one is MOST likely to be the cause of her fever, chills, and hypotension?