THE HUMAN IMMUNE SYSTEM
TYPES OF IMMUNITY
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Detailed explanation-1: -Innate immunity is nonspecific—that is, it is not directed against specific invaders but against any pathogens that enter the body. Only vertebrates have an additional and more sophisticated system of defense mechanisms, called adaptive immunity, that can recognize and destroy specific substances.
Detailed explanation-2: -Immunity is the ability of the body to defend itself against specific invading agents such as bacteria, toxins, viruses and foreign tissues. Substances that are recognised as foreign and provoke an immune response are called antigens.
Detailed explanation-3: -These specialized cells and parts of the immune system offer the body protection against disease. This protection is called immunity.
Detailed explanation-4: -Immune Resistance: The Interaction Between Host and Pathogens in Infectious Diseases.