Pilio patient's contagious excrement is ()
A. Blood
B. stool
C. urine
D. Saliva
E. none of the above
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HDV coinfect host with which of the following virus ()
A. HAV
B. HBV
C. HCV
D. HEV
E. none of the above
Anti-HBs(+), anti-HBc(-), 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
Which virus spread by the fecal-oral route ()
A. HAV
B. HBV
C. HCV
D. HIV
E. none of the above
The key of prevention from Japanese encephalitis is()
A. control mosquitoes
B. widespread vaccination to susceptible people
C. insulate patient
D. young pigs vaccination
E. none of the above
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