PATHOLOGY

Detailed explanation-1: -Summary. The immune system is a complex network of organs, cells and proteins that defends the body against infection, whilst protecting the body’s own cells. The immune system keeps a record of every germ (microbe) it has ever defeated so it can recognise and destroy the microbe quickly if it enters the body again.

Detailed explanation-2: -Immune defense is the ability of higher organisms to identify and combat potentially harmful microorganisms such as viruses, bacteria, fungi, protozoa and helminths by highly sophisticated mechanisms involving soluble factors (Humoral Immunity) and immune competent cells (Cellular Immunity).

Detailed explanation-3: -These specialized cells and parts of the immune system offer the body protection against disease. This protection is called immunity. Humans have three types of immunity-innate, adaptive, and passive: Innate immunity: Everyone is born with innate (or natural) immunity, a type of general protection.