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Microbiology, 9e (Tortora)
Chapter 14
Objective Questions
1) A commensal bacterium
A) Does not receive any benefit from its host.
B) Is beneficial to its host.
C) May be an opportunistic pathogen.
D) Does not infect its host.
E) B and D only.
2) Which of the following statements is true?
A) Symbiosis refers to different organisms living together.
B) Members of a symbiotic relationship cannot live without each other.
C) A parasite is not in symbiosis with its host.
D) Symbiosis refers to different organisms living together and benefiting from each other.
E) At least one member must benefit in a symbiotic relationship.
3) A nosocomial infection is
A) Always present but inapparent at the time of hospitalization.
B) Acquired during the course of hospitalization.
C) Always caused by medical personnel.
D) Only a result of surgery.
E) Always caused by pathogenic bacteria.
4) The major significance of Koch's work was that
A) Microorganisms are present in a diseased animal.
B) Diseases can be transmitted from one animal to another.
C) Microorganisms can be cultured.
D) Microorganisms cause disease.
E) Microorganisms are the result of disease.
5) Koch's postulates don't apply to all diseases because
A) Some microorganisms can't be cultured in laboratory media.
B) Some microorganisms don't cause the same disease in laboratory animals.
C) Some microorganisms cause different symptoms under different conditions.
D) Some microorganisms can't be observed.
E) All diseases aren't caused by microorganisms.
Microbiology, 9e (Tortora)
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6) Which of the following diseases is not spread by droplet infection?
A) Botulism
B) Tuberculosis
C) Measles
D) Common cold
E) Diphtheria
7) Mechanical transmission differs from biological transmission in that mechanical transmission
A) Doesn't require an arthropod.
B) Involves fomites.
C) Doesn't involve specific diseases.
D) Requires direct contact.
E) Doesn't work with noncommunicable diseases.
8) Which of the following definitions is incorrect?
A) Endemic a disease that is constantly present in a population
B) Epidemic fraction of the population having a disease at a specified time
C) Pandemic a disease that affects a large number of people in the world in a short time
D) Sporadic a disease that affects a population occasionally
E) None of the above
9) Which of these infections can cause septicemia?
A) Bacteremia
B) Focal infection
C) Local infection
D) Septicemia
E) Systemic infection
10) Which type of infection can be caused by septicemia?
A) Bacteremia
B) Focal infection
C) Local infection
D) Septicemia
E) Systemic infection
Microbiology, 9e (Tortora)
Chapter 14
11) Koch observed Bacillus anthracis multiplying in the blood of cattle. What is this condition called?
A) Bacteremia
B) Focal infection
C) Local infection
D) Septicemia
E) Systemic infection
12) Nosocomial infections are most often caused by
A) Escherichia coli.
B) Staphylococcus aureus.
C) Enterococcus.
D) Pseudomonas.
E) Klebsiella.
13) Transient microbiota differ from normal microbiota because transient microbiota
A) Cause diseases.
B) Are found in a certain location on the host.
C) Are acquired by direct contact.
D) Are present for a relatively short time.
E) None of the above.
14) Which of the following statements about nosocomial infections is not true?
A) They occur in compromised patients.
B) They are caused by opportunists.
C) They are caused by drug-resistant bacteria.
D) They are caused by normal microbiota.
E) None of the above.
15) One effect of washing regularly with antibacterial agents is the removal of normal microbiota. This can result
in
A) Body odor.
B) Fewer diseases.
C) Increased susceptibility to disease.
D) Normal microbiota returning immediately.
E) No bacterial growth because washing removes their food source.
Microbiology, 9e (Tortora)
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16) Which of the following is not a reservoir of infection?
A) A sick person
B) A healthy person
C) A sick animal
D) A hospital
E) None of the above
17) All of the following are communicable diseases except
A) Malaria.
B) AIDS.
C) Tuberculosis.
D) Tetanus.
E) Typhoid fever.
18) Which of the following is a fomite?
A) Water
B) Droplets from a sneeze
C) Pus
D) Insects
E) A hypodermic needle
19) All of the following statements about biological transmission are true except
A) The pathogen reproduces in the vector.
B) The pathogen may enter the host in the vector's feces.
C) Houseflies are an important vector.
D) The pathogen may be injected by the bite of the vector.
E) The pathogen may require the vector as a host.
20) Which of the following definitions is incorrect?
A) Acute a short-lasting primary infection
B) Inapparent infection characteristic of a carrier state
C) Chronic a disease that develops slowly and lasts for months
D) Primary infection an initial illness
E) Secondary infection a long-lasting illness
Microbiology, 9e (Tortora)
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21) Symptoms of disease differ from signs of disease in that symptoms
A) Are changes felt by the patient.
B) Are changes observed by the physician.
C) Are specific for a particular disease.
D) Always occur as part of a syndrome.
E) None of the above.
22) The science that deals with when diseases occur and how they are transmitted is called
A) Ecology.
B) Epidemiology.
C) Communicable disease.
D) Morbidity and mortality.
E) Public health.
Figure 14.1
23) Figure 14.1 shows the incidence of influenza during a typical year. Which letter on the graph indicates the
endemic level?
A) a
B) b
C) c
D) d
E) None of the above
Microbiology, 9e (Tortora)
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24) Emergence of infectious diseases can be due to all of the following except
A) Antibiotic resistance.
B) Climatic changes.
C) Digging up soil.
D) Microbes trying to cause disease.
E) Travel.
25) Which of the following pairs is mismatched?
A) Malaria vector
B) Salmonellosis vehicle transmission
C) Syphilis direct contact
D) Influenza droplet infection
E) None of the above
26) All of the following can contribute to postoperative infections except
A) Using syringes more than once.
B) Normal microbiota on the operating room staff.
C) Errors in aseptic technique.
D) Antibiotic resistance.
E) None of the above.
Figure 14.2
27) In Figure 14.2, what is the endemic level of rotavirus infections?
A) 0%
B) Approximately 10%
C) Approximately 20%
D) 35%
E) The month of January
28) A cold transmitted by a facial tissue is an example of
A) Direct contact
B) Droplet transmission
C) Fomite
D) Vector
E) Vehicle transmission
Microbiology, 9e (Tortora)
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29) Influenza transmitted by an unprotected sneeze is an example of
A) Direct contact.
B) Droplet transmission.
C) Fomite.
D) Vector.
E) Vehicle transmission.
30) A sexually transmitted disease is an example of
A) Direct contact.
B) Droplet transmission.
C) Fomite.
D) Vector.
E) Vehicle transmission.
31) Gastroenteritis acquired from roast beef is an example of
A) Direct contact.
B) Droplet transmission.
C) Fomite.
D) Vector.
E) Vehicle transmission.
32) A needlestick is an example of
A) Direct contact.
B) Droplet transmission.
C) Fomite.
D) Vector.
E) Vehicle transmission.
Microbiology, 9e (Tortora)
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33) Legionellosis transmitted by a grocery store mist machine is an example of
A) Direct contact.
B) Droplet transmission.
C) Fomite.
D) Vector.
E) Vehicle transmission.
34) Plague transmitted by a flea is an example of
A) Direct contact.
B) Droplet transmission.
C) Fomite.
D) Vector.
E) Vehicle transmission.
35) The most likely mode of transmission of pneumonic plague between humans is
A) Direct contact.
B) Droplet transmission.
C) Fomite.
D) Vector.
E) Vehicle transmission.
Situation 14.1
During a 6-month period, 239 cases of pneumonia occurred in a town of 300 people. A clinical case was defined
as fever ≥39°C lasting >2 days with three or more symptoms (i.e., chills, sweats, severe headache, cough, aching
muscles/joints, fatigue, or feeling ill). A laboratory-confirmed case was defined as a positive result for antibodies
against Coxiella burnetii. Before the outbreak, 2000 sheep were kept northwest of the town. Of the 20 sheep tested
from the flock, 15 were positive for C. burnetii antibodies. Wind blew from the northwest and rainfall was 0.5 cm
compared with 7 to 10 cm during each of the previous three years.
36) Situation 14.1 is an example of
A) Human reservoirs.
B) A zoonosis.
C) A nonliving reservoir.
D) A vector.
E) A focal infection.
Microbiology, 9e (Tortora)
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37) In Situation 14.1, the etiologic agent of the disease is
A) Sheep.
B) Soil.
C) C. burnetii.
D) Pneumonia.
E) Wind.
38) In Situation 14.1, the method of transmission of this disease was
A) Direct contact.
B) Droplet.
C) Indirect contact.
D) Vector-borne.
E) Vehicle.
39) Which one of the following is not an example of microbial antagonism?
A) Acid production by bacteria
B) Bacteriocin production
C) Bacteria occupying host receptors
D) Bacteria causing disease
E) None of the above
40) The yeast Candida albicans does not normally cause disease because of
A) Symbiotic bacteria.
B) Antagonistic bacteria.
C) Parasitic bacteria.
D) Commensal bacteria.
E) None of the above.
41) Haemophilus bacteria require heme protein produced by Staphylococcus bacteria. This is an example of
A) Antagonism.
B) Commensalism.
C) Parasitism.
D) Synergism.
E) None of the above.
Microbiology, 9e (Tortora)
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42) Which one of the following is not a zoonosis?
A) Cat-scratch disease
B) Hantavirus pulmonary syndrome
C) Rabies
D) Tapeworm
E) None of the above
43) Pseudomonas bacteria colonized the bile duct of a patient following his liver transplant surgery. This is an
example of a
A) Communicable disease.
B) Latent infection.
C) Nosocomial infection.
D) Sporadic disease.
E) None of the above.
Figure 14.3
44) The graph in Figure 14.3 shows the incidence of polio in the United States. The period between 1945 and 1955
indicates
A) An endemic level.
B) An epidemic level.
C) A sporadic infection.
D) A communicable disease.
E) None of the above.
Microbiology, 9e (Tortora)
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45) Which one of the following does not contribute to the incidence of nosocomial infections?
A) Formation of biofilms.
B) Lapse in aseptic techniques.
C) Gram-negative cell walls.
D) Lack of hand-washing.
E) Lack of insect control.