MICROANATOMY

Detailed explanation-1: -Preventive Immunity. Immune resistance to an infectious disease requires a critical level of either antigen-specific antibodies and/or T cells when the host encounters the pathogen. Prevention of an infection requires immune mechanisms to kill or inactivate the inoculum of the pathogen.

Detailed explanation-2: -Specific resistance is directed against a particular type of microorganism and is the single most important characteristic of immunity. The immune system enables the body to recognize a foreign agent as nonself, which is something other than a person’s own substances (self).

Detailed explanation-3: -(ih-MYOON reh-SPONTS) The way the body defends itself against substances it sees as harmful or foreign. In an immune response, the immune system recognizes the antigens (usually proteins) on the surface of substances or microorganisms, such as bacteria or viruses, and attacks and destroys, or tries to destroy, them.