Group A Beta Strep Incubation Time

Carles Alonso i Tarrés Carles.Alonso at chcr.scs.es
Fri Oct 3 05:00:29 EST 1997

On 19 Sep 97 02:51:34 GMT, "Lynn Gerber" <lgerbe29 at cybertrails.com>

>There is a bit of controversy at our laboratory as to the length of time a
>culture for group A beta strep should be incubated.  We are using a
>selective strep media which inhibits much of the normal flora.  The
>controversy is whether the negative plates should be kept for more than 24
>hours.  In Bailey and Scott's Diagnostic Microbiology, 9th edition, it
>states that overnight incubation can be used for presumptive
>identification.  No references are given.  Anyone out there have any
>opinions, references, etc. regarding this topic?
>Lynn Gerber

No doubt: you must keep the plates 48 hours. 

Carles Alonso i Tarrés, MD, PhD
Microbiology Laboratory
Red Cross Hospital
L'Hospitalet de Llobregat, Barcelona

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