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==Introduction==
 
==Introduction==
 
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[[Image:TH1-2.jpg|thumb|right|150px|TH1 and 2 selection is influenced by infection - B. Catchpole, RVC 2008]]
 
Within the blood and lymphoid organs the majority of [[T_cells#Helper_CD4.2B|CD4+ T cells]] are antigen-naive T cells. Only a small proportion are memory T cells.  
 
Within the blood and lymphoid organs the majority of [[T_cells#Helper_CD4.2B|CD4+ T cells]] are antigen-naive T cells. Only a small proportion are memory T cells.  
  
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