Which one of the following is a fundamental principle of viral disease causation?
A. One virus type induces a single disease syndrome.
B. Many viral infections are subclinical and do not produce clinical disease.
C. The type of disease produced by a virus can be predicted by the morphology of that virus.
D. A particular disease syndrome has a single viral cause.
E. Social factors do not influence the occurrence of viral diseases.
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During the incubation period of an acute systemic virus infection, ( )
A. characteristic signs of virus infection appear
B. infectious virus cannot be isolated from any tissues
C. infectious virus cannot be shed
D. the host's immune response is stimulated by viral antigens
E. virus is limited to the site of inoculation
Latency is an outcome particularly characteristic of which one of the following virus groups?
A. Polioviruses
B. Herpes viruses
C. Rhinoviruses
D. Influenza viruses
Which one of the following virus can cause vertical transmission?
A. HAV
B. CMV
C. Influenza virus
D. Rabies virus
E. Japanese B encephalitis virus
食品营养学中，根据蛋白质营养价值的高低，可将蛋白质分为（）（）（）三类。
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