I don't mean as one of your five portions of fruit and veg a day :)

I was thinking, I've never been especially fanatical about cleaning  
veg.  I've never bothered washing (organic) celery, and that's always  
got some dirt on it.  Most veg I cook though.

What's the worst you could do to yourself like this?  Are there any  
dangerous viruses, bacteria, parasites or anything you could pick up?   
I live in the UK so I'm thinking of north european soil, although I  
imagine most non-tropical soils would be similar.

Ashley