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Question
Treponema pallidum is extremely sensitive to temperature changes and low moisture, thus it is transmittedA) by intimate person-to-person contact.
B) by fomites.
C) by vectors.
D) through common sources such as food and water.
Answer
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Related questions
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C) lesion.
D) pustule.
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A) gonorrhea.
B) influenza.
C) hepatitis.
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Which disease causes over 1.6 million deaths per year worldwide, which is approximately 11% of all deaths related to infectious diseases?
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Which of the following is the causal agent of gastric ulcers?
A) Staphylococcus aureus
B) Escherichia coli O157:H7
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Which of the following statements about chlamydial infections is TRUE?
A) Chlamydial diseases are not reportable diseases.
B) Chlamydial diseases are less prevalent than gonorrhea.
C) Chlamydial diseases can lead to acute complications.
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The Spanish flu of 1918 was caused by an ________ influenza virus.
A) H2N1
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D) H2N2
Q:
Diseases can be controlled through immunization even if the percentage of the population that is immunized is less than 100% because
A) vectors can be controlled through other means.
B) most diseases lack reservoirs.
C) of herd immunity.
D) vehicles can be sterilized.
Q:
In just over a decade of efforts, the World Health Organization (WHO) eradicated smallpox by using worldwide
A) education campaigns.
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In 2003, the majority of AIDS deaths occurred in
A) South America.
B) North America.
C) Europe.
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The study of the occurrence, distribution, and determinants of health and disease in a population is the field of
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B) immunology.
C) epidemiology.
D) virology.
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Filoviruses (such as Ebola virus) that cause severe hemorrhagic fevers generally have high ________ but low ________.
A) incidence / prevalence
B) prevalence / mortality
C) mortality / morbidity
D) morbidity / mortality
Q:
Cholera is an example of a pandemic disease that
A) has multiple wild animal reservoirs and is thus difficult to eradicate.
B) spreads from a common source and could be controlled with adequate clean water and waste sanitation measures.
C) is spread through direct contact and has only a human reservoir.
D) has recently emerged due to overcrowding in urban centers.
Q:
Influenza pandemics occur cyclically because
A) less than 100% of the population is immunized.
B) new strains emerge due to reassortment between bird, swine, and human variants.
C) the vector is seasonal.
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B) can be virtually any pathogenic bacterium or virus.
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The arrangement of Class II MHC proteins in pairs or trimers enhances their stability.
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A) TC
B) TH
C) B7
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________ ensures that each B cell produces only one immunoglobulin.
A) Self-activation
B) Allelic exclusion
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Q:
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A) anchor residues.
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A) human leukocyte antigen (HLA).
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C) toll-like receptor complex.
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A) clonal expansion.
B) antibody production.
C) complement protein activation.
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Q:
Which of the following is involved in B cell selection and tolerance?
A) clonal anergy
B) clonal deletion
C) clonal anergy and deletion
D) allelic exclusion
Q:
Clonal anergy is a state of
A) antibody production.
B) high energy.
C) unresponsiveness.
D) high energy and antibody production.
Q:
An individual usually expresses ________ structurally distinct allele(s) that encode class I MHC proteins.
A) one
B) two
C) four
D) six