Mycobacterium microti（田鼠型） disease
drinking non-sterilised milk from infected cows
Mycobacterium bovis （牛型） Pasteurization(巴氏消毒) has largely eliminated its infection
Primary infection: firm nodule, deep ulcer form and persist , until the animals die.
reinfection: local induration , superfical ulcer, healed quickly.
Caused by the delayed hypersensitivity and immunity in TB disease.
India. is closely linked to the poor public health in these countries.
The incidence of tuberculosis has declined dramatically over past
decades of years.
Mycobacterium tuberculosis (MTB for short)
is a rod-shaped(杆状), slow-growing, aerobic（需氧）bacterium, has an unusual, waxy（蜡状的）coating on its cell surface (primarily due to the presence of mycolic acid（分枝菌酸）), which accounts for many of its unique clinical characteristics, such as its imperviousness（不通 透性） to Gram staining, so it is classified as an acid-fast bacillus (AFB, 抗酸杆菌).
