Pathogenesis of infectious diseases
The pathogen is only present at the original site of infection and it is carried to other parts of the body by blood, lymph.may be symptomatic or asymptomatic. The pathogenicity degree of an organism is virulence. Though the emerging of is long established, the pathogenesis by which the microorganisms causes illness lagged behind. Some pathogens were recognised during early days of . Knowledge and understanding the pathogenesis of infectious disease provides the idea for diagnosis, prevention and treatment.