Immunity The ability of the body ( host) to fight against the disease causing agent is called immunity Types of immunity (1) Innate Immunity: It refers to all the defence elements with which an individual is born and always available to protect the body. It is a non-specific type of defence system. It is present from the time of birth and inherited from parents. It consists of four types of barrier system that prevent the entry of pathogen or foreign element into the body. Types of Barriers in Innate Immunity (i) Physical Barriers: Skin is the first line of defence. It prevent the entry of the pathogens inside the body . Mucus coating of the epithelium lining in the respiratory, gastrointestinal and urogenital tracts also help in trapping microbes. (ii) Physiological Barriers: Acid in the stomach, saliva in the mouth, tears from the eyes, etc., prevent the growth ot microbes. (iii) Cellular Barrier : special types of cells in our body, which kill the disease
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