Clinical and Diagnostic Virology

Immunology and Vaccine-Preventable Diseases

Immunity is the capacity of the human body to bear the existence of matter original to the body and to banish foreign matter. This prejudicial ability to remove foreign stuff is executed by a complex order of link cells called the immune system. Since most creatures (e.g., bacteria, viruses, and fungi) are recognized as foreign, the capacity to spot and eliminate these materials provides security from infectious diseases. Immunity is normally definite to a single structure or group of closely linked organisms.