BCG vaccine is the variation strain of M.bovis. What is the variation?()
A. colony variation
B. appearance variation
C. structure variation
D. virulence variation
E. none of the above
查看答案
Tuberculin test is ()
A. type Ⅰ hypersensitivity
B. type Ⅱ hypersensitivity
C. type Ⅲ hypersensitivity
D. type Ⅳ hypersensitivity
E. none of the above
Tuberculosis is acquired via the ()
A. Skin
B. Gastrointestinal tract
C. Respiratory tract
D. Genital tract
E. none of the above
Malta fever of brucellosis is because of ()
A. endotoxin release
B. bacteria invade into bloodstream
C. repeatedly bacteremia
D. the result of delayed type hypersensitivity
E. none of the above
The protein coat structure of the virus is called a: ()
A. coat
B. envelop
C. receptor
D. capsid
E. none of the above
微信支付 
支付宝支付