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| 1 | |
Why would the respiratory passages contain less oxygen than air? |
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| 2 | |
How can strict anaerobes exist in the upper respiratory tract? |
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| 3 | |
What is implied by the observation that symptoms of some diseases are
observed only after the organisms are eliminated from the body? |
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| 4 | |
What purpose would adequate ventilation serve in preventing the spread
of streptococcal infections? |
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| 5 | |
People who staff polar ice stations where they are isolated from other
human contact for long periods often do not develop colds. Is this an expected
observation? Why or why not? |
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| 6 | |
Why isn't pertussis toxin eliminated by the mucociliary escalator? |
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| 7 | |
Why should people infected with Mycobacterium tuberculosis react
positively to a skin injection of PPD? Wouldn't a negative reaction seem more
likely if the person is already infected? |
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| 8 | |
Why might you expect an influenza epidemic to be more severe following
an antigenic shift in the virus than after antigenic drift? |
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| 9 | |
In March 2001, 221 students from 37 colleges and universities in 18 states
developed one or more of the following symptoms: fever, cough, shortness
of breath and chest pain. Serological tests indicated acute histoplasmosis.
Most of the students had just returned from spring break in Mexico where
they stayed in a hotel next door to a bulldozing operation. How might the
bulldozing explain the epidemic? |
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