The protein of HIV favoring fusion of host cell membrane and envelope membrane is ()
A. gpl20
B. gp41
C. p24
D. p7
E. none of the above
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All of the following statements are true about transmission of HIV infection EXCEPT ()
A. Sexual transmission is the most common mode of acquiring HIV
B. It is possible to acquire HIV through donated organs
C. HIV-1 and HIV-2 differ in their mode of transmission
D. Sexually transmitted diseases increase the risk of HIV transmission
E. none of the above
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
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
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