抽象的

Immune system and communicable diseases.

Recardo Solomon

Multicellular animals have specialized tissues or cells to combat the risk of infection. Some of these reactions take place right away, enabling prompt containment of an infectious pathogen. Although delayed, other reactions are more suited to the infecting agent. The immune system refers to these defenses as a whole. In a world filled with potentially harmful bacteria, the human immune system is crucial to our survival. Serious impairment of even one component of this system can put a person at risk for serious, even life-threatening infections.