The immune system includes innate and adaptive immune responses. Genetic factors or physiology due to innate immunity; It is not induced by infection or vaccination, but rather by the adaptive immune response of the workload. The innate and adaptive levels of the immune response involve secreted proteins, receptor-mediated signaling and complex cell-to-cell communication. The innate immune system developed at the beginning of animal evolution, about a billion years ago, as an essential response to infection. Innate immunity has a limited number of specific targets: any pathogenic threat triggers a coherent sequence of events that can be detected by either the pathogen and the ability to independently or mobilize a highly adaptive immune response. For example, microbicidal factors that contain tears and mucus secretions
Cytokines called recombinant immune cells versus infection sites, including several chemical mediators. Activation of the complement cascade to identify bacteria, activate cells and promote clearance of antibody complexes or dead cells. Identification and elimination of foreign substances present in organs, tissues, blood and lymph, by white blood cells. The immune system adaptation of activation Act as a physical and chemical barrier to infectious agents; viable physical measures such as skin or bark of trees and chemical measures such as coagulation factors in the blood or sap of a tree. Anatomical barriers include physical, chemical and biological barriers. The epithelial surfaces form a physical barrier impermeable to most infectious agents, acting as the first line of defense against invading organisms. The skin epithelium also helps remove bacteria and other infectious agents that are adhered to the epithelial surfaces.