题目内容

Which disease is caused by rickettsia? ()

A. Syphilis
B. Trachoma
C. lyme disease
D. lymphograuloma venereum
E. scrub typhus

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Which one of following structure determines the virus infectivity ()

A. capsomere
B. nucleic acid
C. capsid
D. spikes
E. envelope

Which part of viral replication cycle characterizes eclipse phase?()

A. attachment
B. penetration
C. uncoating
D. synthesis of viral components
E. assembly and release

Which antigen is used to divide influenza viruses onto types A, B and C? ()

A. HA+NA
B. NP+MP
C. M1P
D. M2P
E. RNP

All of the following are stable at pH 3 EXCEPT ()

A. Coxsackie A Viruses
B. Coxsackie B Viruses
C. Echoviruses
D. Polioviruses
E. Rhinoviruses