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How does the third line of defence against disease work?

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Wiki User
11/18/2008

the third line of defence work as a Primary Responce and a Secondary Responce the Primary Responce occurs when first a pathagen enter the body and secondly lymphocytes (b-cell) produce antibodies and finally antibodies have a speific shape which bind to antigens on surface of pathagen and then the dead pathagen is digested is eaten by phagocytes The Second Responce is the vaccination that contain live pathagen treated to make them harmless and it contain harmless fragment of the pathagen and dead phagen or toxins produced by pathagen and while vaccine is given we will gel active immunity because that vaccine will produce antibodies for ever