The reason that influenza A virus causes pandemic ()
A. the structure of viral antigen is complex
B. antigen drift
C. antigen shift
D. too many types of influenza virus
E. none of the above
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Nucleic acid type of enterovirus is ()
A. dsDNA
B. dsRNA
C. ss(+) RNA
D. ss(-)RNA
E. none of the above
Anti-HBs(-), anti-HBc(-), HBeAg(-), HBsAg(+) in the serum, the most likely explanation is ()
A. HBV carriers
B. has already become chronic hepatitis B
C. The serum has infectivity
D. has already recover from hepatitis B
E. none of the above
The epidemic HFRS virus is asscioated with which animal()
A. Rat
B. Cat
C. Dog
D. Pig
E. none of the above
Which of the following description about HSV pathogenesis is false ()?
A. Patient and healthy carriers as infection source
B. contact transmission
C. primary infection lead to latent infection for the immune suppression person
D. no symptom for infants HSV-1 infection
E. none of the above
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