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問(wèn)答題

_________ is caused by the hepatitis B virus （）.

答案： Hepatitis B is caused by the hepatitis B virus.

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Which one of the following statements describes an advantage of killed-virus vaccines over attenuated live-virus vaccines？

A．Killed-virus vaccines induce a broader range of immune responses than do attenuated live-virus vaccinesB．Killed-virus vaccines more closely mimic natural infections than do attenuated live-virus vaccinesC．Killed-virus vaccines pose no risk that vaccine virus might be transmitted to susceptible contactsD．Killed-virus vaccines are efficacious against respiratory virus infections because they induce good mucosal immunityE．All above are correct