Delost Introduction to
Diagnostic Microbiology with
correct answers 2025
CHAPTER 1
Match the following terms with the correct definition:
1. Infection
a. Condition associated with functional and structural
harm to the host, accompanied by signs and
symptoms
b. Infection in an immunocompromised host that
does not cause infection in an immunocompetent
individual
c. Infection acquired in a health care setting
d. Presence and multiplication of a microorganism in a
host with no clinical signs of infection
e. Entrance and multiplication of a microorganism in a
host CORRECT ANSWERS e. Entrance and multiplication of a microorganism in a host
Match the following terms with the correct definition:
2. Infectious disease
a. Condition associated with functional and structural
harm to the host, accompanied by signs and
,symptoms
b. Infection in an immunocompromised host that
does not cause infection in an immunocompetent
individual
c. Infection acquired in a health care setting
d. Presence and multiplication of a microorganism in a
host with no clinical signs of infection
e. Entrance and multiplication of a microorganism in a
host CORRECT ANSWERS a. Condition associated with functional and structural harm
to the host, accompanied by signs and symptoms
Match the following terms with the correct definition:
3. Opportunistic infection
a. Condition associated with functional and structural
harm to the host, accompanied by signs and
symptoms
b. Infection in an immunocompromised host that
does not cause infection in an immunocompetent
individual
c. Infection acquired in a health care setting
d. Presence and multiplication of a microorganism in a
host with no clinical signs of infection
e. Entrance and multiplication of a microorganism in a
host CORRECT ANSWERS b. Infection in an immunocompromised host that
does not cause infection in an immunocompetent
individual
Match the following terms with the correct definition:
4. Nosocomial infection
a. Condition associated with functional and structural
harm to the host, accompanied by signs and
symptoms
b. Infection in an immunocompromised host that
does not cause infection in an immunocompetent
individual
c. Infection acquired in a health care setting
d. Presence and multiplication of a microorganism in a
host with no clinical signs of infection
e. Entrance and multiplication of a microorganism in a
host CORRECT ANSWERS c. Infection acquired in a health care setting
Match the following terms with the correct definition:
5. Colonization
a. Condition associated with functional and structural
harm to the host, accompanied by signs and
symptoms
,b. Infection in an immunocompromised host that
does not cause infection in an immunocompetent
individual
c. Infection acquired in a health care setting
d. Presence and multiplication of a microorganism in a
host with no clinical signs of infection
e. Entrance and multiplication of a microorganism in a
host CORRECT ANSWERS d. Presence and multiplication of a microorganism in a
host with no clinical signs of infection
6. All the following sites contain normal flora except:
a. Oral cavity
b. Skin
c. Colon
d. Cerebrospinal fluid CORRECT ANSWERS d. Cerebrospinal fluid
7. Which of the following is not classified as a direct route
of infection?
a. Ingestion of contaminated food or water
b. Sexual contact
c. Hand-to-hand contact
d. Congenital contact CORRECT ANSWERS a. Ingestion of contaminated food or water
8. Droplet infection through contact with infectious
respiratory secretions may be described as:
a. Inhalation of infectious aerosols during laboratory
procedures
b. Transmission of rhinovirus through failing to wash
hands
c. Spread of respiratory viruses and Streptococcus
pyogenes through coughing or sneezing
d. Inhalation of bacteria or viruses that have dried on
bedding or clothing CORRECT ANSWERS d. Inhalation of bacteria or viruses that have
dried on
bedding or clothing
9. Which of the following organisms are typically spread
through the ingestion of contaminated food or water?
a. Neisseria meningitidis and S. pyogenes
b. Salmonella and Shigella
c. Herpes simplex virus and Treponema pallidum
d. Plasmodium and Borrelia CORRECT ANSWERS b. Salmonella and Shigella
10. Which of the following organisms are spread through
arthropod vectors?
a. N. meningitidis and S. pyogenes
, b. Salmonella and Shigella
c. Herpes simplex virus and T. pallidum
d. Plasmodium and Borrelia CORRECT ANSWERS d. Plasmodium and Borrelia
11. Innate, or natural, immunity involves which of the
following mechanisms?
a. Mucus and cilia in the respiratory tract that help to
trap and clear microorganisms
b. Humoral immunity
c. Cell-mediated immunity
d. Immunity resulting from vaccination CORRECT ANSWERS a. Mucus and cilia in the
respiratory tract that help to
trap and clear microorganisms
12. The movement of neutrophils and monocytes from the
blood to injured tissue is known as:
a. Diapedesis
b. Chemotaxis
c. Ingestion
d. Hematopoiesis CORRECT ANSWERS a. Diapedesis
13. Antibody-producing white blood cells are:
a. Macrophages
b. Neutrophils
c. T lymphocytes
d. B lymphocytes CORRECT ANSWERS d. B lymphocytes
14. Which of the following cells play a major role in cell-mediated
immunity?
a. Macrophages
b. Neutrophils
c. T lymphocytes
d. B lymphocytes CORRECT ANSWERS c. T lymphocytes
15. The immunoglobulin found in the highest
concentration in normal serum is:
a. IgA
b. IgD
c. IgE
d. IgG
e. IgM CORRECT ANSWERS d. IgG
16. Which of the following immunoglobulins is involved
mainly in the primary immune response?
a. IgA
b. IgD
Diagnostic Microbiology with
correct answers 2025
CHAPTER 1
Match the following terms with the correct definition:
1. Infection
a. Condition associated with functional and structural
harm to the host, accompanied by signs and
symptoms
b. Infection in an immunocompromised host that
does not cause infection in an immunocompetent
individual
c. Infection acquired in a health care setting
d. Presence and multiplication of a microorganism in a
host with no clinical signs of infection
e. Entrance and multiplication of a microorganism in a
host CORRECT ANSWERS e. Entrance and multiplication of a microorganism in a host
Match the following terms with the correct definition:
2. Infectious disease
a. Condition associated with functional and structural
harm to the host, accompanied by signs and
,symptoms
b. Infection in an immunocompromised host that
does not cause infection in an immunocompetent
individual
c. Infection acquired in a health care setting
d. Presence and multiplication of a microorganism in a
host with no clinical signs of infection
e. Entrance and multiplication of a microorganism in a
host CORRECT ANSWERS a. Condition associated with functional and structural harm
to the host, accompanied by signs and symptoms
Match the following terms with the correct definition:
3. Opportunistic infection
a. Condition associated with functional and structural
harm to the host, accompanied by signs and
symptoms
b. Infection in an immunocompromised host that
does not cause infection in an immunocompetent
individual
c. Infection acquired in a health care setting
d. Presence and multiplication of a microorganism in a
host with no clinical signs of infection
e. Entrance and multiplication of a microorganism in a
host CORRECT ANSWERS b. Infection in an immunocompromised host that
does not cause infection in an immunocompetent
individual
Match the following terms with the correct definition:
4. Nosocomial infection
a. Condition associated with functional and structural
harm to the host, accompanied by signs and
symptoms
b. Infection in an immunocompromised host that
does not cause infection in an immunocompetent
individual
c. Infection acquired in a health care setting
d. Presence and multiplication of a microorganism in a
host with no clinical signs of infection
e. Entrance and multiplication of a microorganism in a
host CORRECT ANSWERS c. Infection acquired in a health care setting
Match the following terms with the correct definition:
5. Colonization
a. Condition associated with functional and structural
harm to the host, accompanied by signs and
symptoms
,b. Infection in an immunocompromised host that
does not cause infection in an immunocompetent
individual
c. Infection acquired in a health care setting
d. Presence and multiplication of a microorganism in a
host with no clinical signs of infection
e. Entrance and multiplication of a microorganism in a
host CORRECT ANSWERS d. Presence and multiplication of a microorganism in a
host with no clinical signs of infection
6. All the following sites contain normal flora except:
a. Oral cavity
b. Skin
c. Colon
d. Cerebrospinal fluid CORRECT ANSWERS d. Cerebrospinal fluid
7. Which of the following is not classified as a direct route
of infection?
a. Ingestion of contaminated food or water
b. Sexual contact
c. Hand-to-hand contact
d. Congenital contact CORRECT ANSWERS a. Ingestion of contaminated food or water
8. Droplet infection through contact with infectious
respiratory secretions may be described as:
a. Inhalation of infectious aerosols during laboratory
procedures
b. Transmission of rhinovirus through failing to wash
hands
c. Spread of respiratory viruses and Streptococcus
pyogenes through coughing or sneezing
d. Inhalation of bacteria or viruses that have dried on
bedding or clothing CORRECT ANSWERS d. Inhalation of bacteria or viruses that have
dried on
bedding or clothing
9. Which of the following organisms are typically spread
through the ingestion of contaminated food or water?
a. Neisseria meningitidis and S. pyogenes
b. Salmonella and Shigella
c. Herpes simplex virus and Treponema pallidum
d. Plasmodium and Borrelia CORRECT ANSWERS b. Salmonella and Shigella
10. Which of the following organisms are spread through
arthropod vectors?
a. N. meningitidis and S. pyogenes
, b. Salmonella and Shigella
c. Herpes simplex virus and T. pallidum
d. Plasmodium and Borrelia CORRECT ANSWERS d. Plasmodium and Borrelia
11. Innate, or natural, immunity involves which of the
following mechanisms?
a. Mucus and cilia in the respiratory tract that help to
trap and clear microorganisms
b. Humoral immunity
c. Cell-mediated immunity
d. Immunity resulting from vaccination CORRECT ANSWERS a. Mucus and cilia in the
respiratory tract that help to
trap and clear microorganisms
12. The movement of neutrophils and monocytes from the
blood to injured tissue is known as:
a. Diapedesis
b. Chemotaxis
c. Ingestion
d. Hematopoiesis CORRECT ANSWERS a. Diapedesis
13. Antibody-producing white blood cells are:
a. Macrophages
b. Neutrophils
c. T lymphocytes
d. B lymphocytes CORRECT ANSWERS d. B lymphocytes
14. Which of the following cells play a major role in cell-mediated
immunity?
a. Macrophages
b. Neutrophils
c. T lymphocytes
d. B lymphocytes CORRECT ANSWERS c. T lymphocytes
15. The immunoglobulin found in the highest
concentration in normal serum is:
a. IgA
b. IgD
c. IgE
d. IgG
e. IgM CORRECT ANSWERS d. IgG
16. Which of the following immunoglobulins is involved
mainly in the primary immune response?
a. IgA
b. IgD
