"Michael Carpenter" <mikecarpenter2000 at hotmail.com> wrote in message
news:33cd959b.0402051352.23905c9d at posting.google.com...
> "EK" <nobody at elnino.com> wrote in message
news:<wpiUb.14$_4.2063 at news.uchicago.edu>...
> > > If a colony of e. coli grows on manitol salt agar, is this colony
> > > pathogenic?
> > Is this a pathogenic E.coli strain?
>> It is supposed to be a strain obtained from fecal matter, which I
> would assume is not pathogenic.
Well, the fecal matter may come from a diseased person or animal. Otherwise,
if the strain is not pathogenic, it will not become pathogenic if you just
grow it on some medium. For example, you can grow some photosynthetic
bacteria in the dark, but this does not make them not capable of
photosynthesis if you transfer them in the appropriate environment.