the sequence of host-defense against microbial invasion consists of nonspecific active substances which are distributed diffusely in the body fluids and exert their functions quickly to eliminate microorganisms , nonspecific humoral elements capable of exerting their functions selectively at the site of microbial invasion , neutrophils , scavenger macrophages , protection at an early stage by igm antibody or a type of cell-mediated immunity ( primitive t cell response ) and protection at a late stage by typical immunities .
C0520990
host-defense
C0020964
immunities