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Question
A positive tuberculin test means a patientA) has active disease.
B) has been previously exposed to Mycobacterium tuberculosis.
C) has a current inappropriate infection.
D) has active disease, has been previously exposed to Mycobacterium tuberculosis, or has a current inappropriate infection.
Answer
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B) influenza.
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Which of the following statements about chlamydial infections is TRUE?
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The Spanish flu of 1918 was caused by an ________ influenza virus.
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B) most diseases lack reservoirs.
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In 2003, the majority of AIDS deaths occurred in
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C) Europe.
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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
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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.
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Influenza pandemics occur cyclically because
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Which of the following is involved in B cell selection and tolerance?
A) clonal anergy
B) clonal deletion
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An individual usually expresses ________ structurally distinct allele(s) that encode class I MHC proteins.
A) one
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C) four
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