In article ,
Jeff Layman wrote:

Depends which E. coli you are talking about. Many strains are highly
pathogenic; I wouldn't like 0157 in me, for example, immunosuppressed or
not. More info here if you don't mind being too bored:
http://textbookofbacteriology.net/e.coli.html

For "highly", read "slightly"!

I wouldn't worry about 0157 - indeed, I may have it, for all I know
to the contrary - as it is dangerous only to the very young, very
old and immunosuppressed. If you look at the reference you gave,
most of the pathogenic forms are described as dangerous to infants.

All forms (even the symbiotic ones) are dangerous if they grow in
the wrong place, which is one of the reasons you need immunity to
a wide range of them.


Regards,
Nick Maclaren.