INFECTION

INFECTION
Infection is the lodgment and mulplication of the infectious agent in or on the tissues of the host. The infection may be acquired by contact, inhalation ingestion, or inoculation, or from insects, or may be iatrogenic or congenital. It can be classified into primary infection (initial infection with an infectious agent in a host), reinfection (subsequent infection by the same infectious agents in the host and secondary infection) (a new agent set up an infection when pre-existing infectious disease lowers the resistance). Depending upon the source, infection is classified into exogenous where infection from the external sources and endogenous when infection is from the host’s own body.