Different counts in MacConkey Agar

Yjgent yjgent at aol.com
Fri May 26 20:36:18 EST 2000

>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
John Gentile M(ASCP)                   President - Rhode Island Apple Group
yjgent at aol.com
Microbiologists do it with culture.

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