[Taxacom] E. coli contamination of food plants

[Ken Kinman]

Dear All,
     Perhaps a botanist on the list could clarify something for me.  Washing 
contaminated leafy greens doesn't help much if the toxic E. coli has been 
actually absorbed into the tissues.  What food plants (other than leafy 
greens) could potentially present the same problem?  Could underground 
tubers, like potatoes and radishes be just as vulnerable to such internal 
contamination?  On the other hand, would fruits on trees be relatively 
immune to such contamination of their internal tissues?
   -----Thanks,
           Ken Kinman