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*Date: [http://www.wikipedia.org/wiki/14th_Century 14th century]
==Definitions==
*1 : the [[quality]] or [[state]] of being immune; especially : a condition of being able to [[resist]] a particular [[disease]] especially through preventing [[development]] of a pathogenic [[microorganism]] or by counteracting the [[effects]] of its products
==Description==
'''Immunity''' is a [[biological]] term that describes a [[state]] of having sufficient [[biological]] [[defense]]s to avoid infection, [[disease]], or other unwanted [[biological]] [[invasion]]. Immunity involves both specific and non-specific components. The non-specific components act either as barriers or as eliminators of wide range of pathogens irrespective of antigenic specificity. Other components of the immune system adapt themselves to each new disease encountered and are able to generate pathogen-specific immunity.
[http://en.wikipedia.org/wiki/Adaptive_immunity Adaptive immunity] is often sub-divided into two major [[types]] depending on how the immunity was introduced.
*''Naturally acquired immunity'' occurs through contact with a [[disease]] causing [[agent]], when the contact was not [[deliberate]], whereas
*''Artificially acquired immunity'' [[develops]] only through [[deliberate]] [[actions]] such as vaccination. Both [[naturally]] and [[artificially]] acquired immunity can be further subdivided depending on whether immunity is induced in the [[host]] or passively [[transfer]]red from a immune host.
''Passive immunity'' is acquired through [[transfer]] of antibodies or activated T-cells from an immune host, and is short lived -- usually lasting only a few months ''Active immunity'' is induced in the [[host]] itself by antigen, and lasts much longer, sometimes life-long.[http://en.wikipedia.org/wiki/Immunity_%28medical%29]
[[Category: Health]]
*Date: [http://www.wikipedia.org/wiki/14th_Century 14th century]
==Definitions==
*1 : the [[quality]] or [[state]] of being immune; especially : a condition of being able to [[resist]] a particular [[disease]] especially through preventing [[development]] of a pathogenic [[microorganism]] or by counteracting the [[effects]] of its products
==Description==
'''Immunity''' is a [[biological]] term that describes a [[state]] of having sufficient [[biological]] [[defense]]s to avoid infection, [[disease]], or other unwanted [[biological]] [[invasion]]. Immunity involves both specific and non-specific components. The non-specific components act either as barriers or as eliminators of wide range of pathogens irrespective of antigenic specificity. Other components of the immune system adapt themselves to each new disease encountered and are able to generate pathogen-specific immunity.
[http://en.wikipedia.org/wiki/Adaptive_immunity Adaptive immunity] is often sub-divided into two major [[types]] depending on how the immunity was introduced.
*''Naturally acquired immunity'' occurs through contact with a [[disease]] causing [[agent]], when the contact was not [[deliberate]], whereas
*''Artificially acquired immunity'' [[develops]] only through [[deliberate]] [[actions]] such as vaccination. Both [[naturally]] and [[artificially]] acquired immunity can be further subdivided depending on whether immunity is induced in the [[host]] or passively [[transfer]]red from a immune host.
''Passive immunity'' is acquired through [[transfer]] of antibodies or activated T-cells from an immune host, and is short lived -- usually lasting only a few months ''Active immunity'' is induced in the [[host]] itself by antigen, and lasts much longer, sometimes life-long.[http://en.wikipedia.org/wiki/Immunity_%28medical%29]
[[Category: Health]]
