We use the A disk as a screen and the latex agglutination as confirmatory if
the screen is questionable. We only use the PYRase along with GLCase for our
Enterococcus. I do warn people though if they see a positive PYRase and a
negative GLCase to think about Strep Group A.
John Gentile Rhode Island Apple Group
yjgent at home.com President
"I never make mistakes, I only have unexpected learning opportunities"
> From: "Patrick Druggan" <Patrick.Druggan at btinternet.com>
> Organization: BT Internet
> Newsgroups: bionet.microbiology
> Date: Sun, 29 Jul 2001 13:08:42 +0100
> Subject: Bacitracin and Group A Streps
>> I've got a question for the clinicians out there. I'm a food microbiologist,
> so I apoligise if this is a stupid question.
>> I've read some papers from the mid-80s on the use of PYR as a more specific
> alternative to the bacitracin suseptibility test for presumptive
> identification of Group A streptococci.
>> Did the PYR test displace the bacitracin suseptibility test, or is the
> method used dependant on the lab carrying out the identification?