In general, if not already produced by the body of patients with drug-resistant Mycobacterium tuberculosis directinfection, suffering from TB drug resistance is unlikely.
一般来说，如果不是被身体中已经产生耐药结核杆菌的患者直接传染，患上耐药性的结核病的可能性不大。
2
The human deaths from H5N1 have so far occurred as a result of directinfection from birds - except in two outbreaks where rare human-to-human transmission appears to have occurred.
至今所有死于禽流感的患者除了两例罕见人与人之间传播的病例外，均为直接从鸟类感染。
3
KoRV (koala retrovirus) integrates itself into the animalsa DNA, and may be passed on genetically as well as through directinfection, experts have found, though they are unsure how it is spread.