The BCG vaccination objects should be ()
A. Old-age people
B. Tuberculin test positive people
C. new borns and tuberculin test negative people
D. Serious tubercle patient, with negative tuberculin test
E. none of the above
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The site of initial infection of M.tuberculosis is usually()
A. stomach
B. intestine
C. lung
D. bone
E. none of the above
What kind of virus can integrate it's gene in the host cell genome()
A. dsDNA virus and retrovirus
B. +ssRNA virus and retrovirus
C. dsRNA virus and retrovirus
D. ssDNA virus and +ssRNA virus
E. none of the above
Viral particles can be identified within the cell at all stages except: ()
A. attachmente
B. clipse
C. latent
D. lysis
E. none of the above
Which of the following are the first products produced by minus strand viruses? ()
A. RNA
B. DNA
C. protein
D. envelop
E. none of the above
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