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59 bytes added ,  17:09, June 3, 2007
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Waning immunity is the loss of protective [[antibodies]] over time.  
 
Waning immunity is the loss of protective [[antibodies]] over time.  
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Vaccines often have waning immunity.
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Vaccines often have waning immunity against antibodies which evolve the ability to resist them.
 
[[Category:Medicine]]
 
[[Category:Medicine]]
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