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per·sis·tent

adj 1  :  existing or continuing for a long time: as  a  :  effective in the open for an appreciable time usu. through slow volatilizing <mustard gas is >   b  :  degraded only slowly by the environment < pesticides>   c  :  remaining infective for a relatively long time in a vector after an initial period of incubation < viruses>   2  :  continuing to exist despite interference or treatment <a cough>  .
 
 

 
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St. Marks Medical Center (LaGrange, Texas - Fayette County)