The ability of the body to resist a disease by natural or artificial means.
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immunity is the capability of multicellular organisms to resist harmful microorganisms. Immunity involves both specific and nonspecific components.
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The ability of the body to resist a disease by natural or artificial means is called IMMUNITY.
"Immunis" (immunity)-Latin word meaning protection
The immunity is divided into three types :
INNATE IMMUNITY :
It is the first line of defense in the human body and
springs into action immediately after an infection begins and does not depend upon the host's prior exposure to the pathogen
It produces interferons / Active NK(natural killer) cells.
ADAPTIVE IMMUNITY :
It is the final line of defense and is most sophisticated and more powerful defense system that operates later in an infection and are highly specific for the pathogen that induced them.
PASSIVE IMMUNITY :
It is a immunity "borrowed" from another source and it lasts for a short time.