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Question
In 2003, the majority of AIDS deaths occurred inA) South America.
B) North America.
C) Europe.
D) Sub-Saharan Africa.
Answer
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Related questions
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D) pustule.
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B) influenza.
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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 statements about chlamydial infections is TRUE?
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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.
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D) H2N2
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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.
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In just over a decade of efforts, the World Health Organization (WHO) eradicated smallpox by using worldwide
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The study of the occurrence, distribution, and determinants of health and disease in a population is the field of
A) microbiology.
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 ________.
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B) prevalence / mortality
C) mortality / morbidity
D) morbidity / mortality
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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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A) gastrointestinal tract
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Potential candidates for biological warfare
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B) can be virtually any pathogenic bacterium or virus.
C) are eukaryotic rather than prokaryotic.
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The arrangement of Class II MHC proteins in pairs or trimers enhances their stability.
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________ ensures that each B cell produces only one immunoglobulin.
A) Self-activation
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The major histocompatibility complex is also called the
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Which of the following is involved in B cell selection and tolerance?
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B) clonal deletion
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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
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TC cells express a(n) ________ protein co-receptor.
A) CD4
B) CD8
C) IgM
D) IgG