Rather, HIV, the virus that causes it, weakens the body's immune system and exposes the sufferer to secondary infections.
由HIV病毒引起的艾滋病先是导致了病人免疫系统功能减弱，继而使病人产生继发感染。
2
Thirdly, it can stimulate secondaryimmune respond efficiently and speedily for the inbreak of similar antigen.
三是能对类似抗原入侵产生迅速高效的二次免疫应答。
3
The damaged immune is much less capable of defending against usual disease challenges and the bird is more likely to suffer or die from any of a number of secondary infections.