MCQs Mock Test for Lab Technicians and Technologists: Chapter 35

To design a vaccine against HIV infection, a logical goal would be to alter some native molecule or product of the virion in order to make it highly immunogenic. If you wished to prevent the attachment of the virus to helper T lymphocytes, which molecule or family of molecules might best be targeted?

Each of the following statements concerning rubella vaccine is correct EXCEPT:

A 42-year-old man who has AIDS presents to his physician with progressively increasing dyspnea over the past 3 weeks. He also complains of a dry, painful cough, fatigue, and low-grade fever. A chest x-ray reveals bilateral symmetrical interstitial and alveolar infiltration. Which of the following agents is the most likely cause of the above?

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?

Trophozoites, Schizonts and gametocytes of all the malarial parasites are seen in the peripheral blood smear except;

A bone marrow transplant recipient becomes febrile and hypoxic and chest films demonstrate diffuse interstitial pneumonia. What is the most likely causal agent?

Which one of the following protozoa primarily infects macrophages?

Which one of the following statements concerning immunization against diseases caused by clostridia is CORRECT?

The two most common types of viral vaccines are killed vaccines and live, attenuated vaccines. Regarding these vaccines, which one of the following statements is the MOST accurate?

Stormy clot reaction is useful in the identification of:

Each of the following statements concerning the rabies vaccine for use in humans is correct EXCEPT:

You suspect that your patient’s disease may be caused by Cryptococcus neoformans. Which one of the following findings would be MOST useful in establishing the diagnosis?

The MOST important protective function of the antibody stimulated by tetanus immunization is:

Nagler’s reaction is useful for the identification of

Each of the following statements concerning clostridia is correct EXCEPT:

A 4-year-old girl has papular and pustular lesions on her face. The lesions are exuding a honey-colored serous fluid. You make a clinical diagnosis of impetigo. A Gram stain of the exudate reveals gram-positive cocci in chains, and a culture reveals ß-hemolytic colonies on blood agar. For which one of the following sequelae is she MOST at risk?

A 25-year-old man gets into a fight at the local bar and punches another patron in the mouth. The following day his fist becomes infected and he visits a local urgent care center. Exudate from the wound is cultured on blood and chocolate agar and reveals gram-negative rods that have a bleach-like odor. Which of the following agents is the most likely cause?

A 42-year-old man who has AIDS presents to his physician with progressively increasing dyspnea over the past 3 weeks. He also complains of a dry, painful cough, fatigue, and low-grade fever. A chest x-ray reveals bilateral symmetrical interstitial and alveolar infiltration. Which of the following agents is the most likely cause of the above?

Each of the following statements concerning Candida albicans is correct EXCEPT:

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

A 1 9-year-old migrant worker from the southwestern U.S. is brought to the family doctor complaining of cough, pleuritic chest pain, fever, and malaise. He also complains of a backache and headache. He is found to have an erythematous skin rash on his lower limbs. A chest radiograph reveals several calcifying lesions. Which of the following structures is most likely to be found?

Each of the following parasites has an intermediate host as part of its life cycle EXCEPT:

Each of the following statements concerning Staphylococcus aureus is correct EXCEPT:

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 55-year-old man who recently recovered uneventfully from a heart valve transplant presents to the emergency room with pleuritic chest pain, hemoptysis, fever, and chills. While he is being examined, he has a myocardial infarction and the medical team is unable to revive him. An autopsy revealed septate, acutely branching hyphae in many tissues. Which of the following organisms is most likely to be identified?

A 16-year-old has pneumonia with a dry, hacking cough. The x-ray pattern shows a light, diffuse infiltrative pattern. The most likely organism producing these symptoms is

A 1 5-year-old member of the high school swim team notices painless, umbilicated cutaneous lesions on the toes. Large eosinophilic cytoplasmic inclusions are present in the affected epithelia. What is the most likely causal agent?

Aspergillus fumigatus can be involved in a variety of clinical conditions. Which one of the following is LEAST likely to occur?

Your patient is a woman with a vaginal discharge. You suspect, on clinical grounds, that it may be due to Candida albicans. Which one of the following statements is LEAST accurate or appropriate?

How many pairs of flagella are present in the trophozoite of Giardia lamblia?

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

For which one of the following bacterial vaccines are toxic side effects an important concern?

A 33-year-old HIV-positive man complains of headache and blurred vision. Physical examination reveals papilledema and ataxia. A head CT scan is normal, but CSF obtained by lumbar puncture reveals encapsulated organisms visible by India ink. Which of the following is true concerning this organism?

Each of the following statements concerning mucormycosis is correct EXCEPT:

Contamination of umbilical cord at birth may lead to infection by:

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?

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.

You have made a clinical diagnosis of meningitis in a 50-year-old immunocompromised woman. A latex agglutination test on the spinal fluid for capsular polysaccharide antigen is positive. Of the following organisms, which one is the MOST likely cause?

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

A living microbe with reduced virulence that is used for vaccination is considered:

A 35-year-old man who is positive for HIV develops sepsis with the subsequent development of a necrotic lesion on the buttock that has a black center and an erythematous margin. Which of the following is the most likely causal agent?

Each of the following statements concerning Corynebacterium diphtheriae is correct EXCEPT:

A 45-year-old man was attacked by a bobcat and bitten repeatedly about the face and neck. The animal was shot by a companion and brought back to the public health authorities. Once you decide to immunize against rabies virus, how would you proceed?

Each of the following statements concerning certain gram-negative rods is correct EXCEPT:

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

Several fungi are associated with disease in immunocompromised patients. Which one of the following is the LEAST frequently associated?

The MOST important contribution of the capsule of Streptococcus pneumoniae to virulence is:

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

Each of the following statements concerning Clostridium perfringens is correct EXCEPT:

After one week vacationing in Mexico, a 14-year-old girl presents with abdominal pain, nausea, bloody diarrhea, and fever. Stool specimens are collected and sent to the laboratory for bacteriologic and parasitologic examination. Bacterial cultures are negative for intestinal pathogens. The laboratory report reveals organisms with red blood cells inside them. The most likely causal agent is