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Different counts in MacConkey Agar

Lynn kees.lyn at xtra.co.nz
Sun May 28 04:51:29 EST 2000


Yjgent wrote:
> 
> >In this lab we're working with E.Coli (ATCC 25922 and wild type) and we
> >routinely use MacConkey Agar inclusion plating as a counting method for
> >these microorganisms.
> 
> I was taught a long time ago NOT to measure a colony count from a Mac plate.
> Only a non selective agar like TSA or a Blood Agar plate can be used to count
> colonies.
> John Gentile M(ASCP)                   President - Rhode Island Apple Group
> yjgent at aol.com
> Microbiologists do it with culture.


Why was this? are the recovery rates too low?
Lynn






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