mani
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1 S aureus
2...........
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| mjl1717
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Yersinia pestis
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| MLF
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Streptococci
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| doc_rajan
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I've not read of Streptococcus producing a coagulase. There are only two bacteria which do...
Staph. aureus and Yersinia pestis.
In Staph, it helps in coagulation of blood proteins, thus helping it to adhere to the coagulum and helping in its pathogenicity..
whereas in Yersinia, it helps in transmission of the bacterium from the flea..
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| MLF
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Sorry i meant to type Staph, which now is also already in the answer, typo
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| mani
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the list is:
1 S aureus
2 Yersinia pestis
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| bactitech
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I have been in micro many years and have never heard of coagulase used in the identification of Y. pestis, as it is a gram negative rod.
Coagulase testing is done on Staphylococci to differentiate between S. aureus and other coag neg staphs. Nowadays it is done with commercially available coated latex particles. We still use coagulase plasma when the tube tests are necessary.
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| mani
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yes, its not routinely used for Y pestis idedntification, but this bug is coagulase positive. i think it used for S aureus bcoz it helps to differentiate it from other members of its family that are morphologically similar
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| bactitech
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Just so everyone knows that Y. pestis is NOT a routine isolate in a medical micro lab. The organism is supposedly still endemic in some parts of California (wooded areas away from people, with the reservoir host being ground squirrels, etc.) and if one of your cultures keyed out positive for Y. pestis there would be quite a turmoil in the lab. I believe this is one of the organisms that must be worked with at Level 2 labs (most labs are level 1), must be reported to the health department, etc. and is tracked.
When bacterial unknowns are sent out by accrediting agencies, stuff like this is NEVER sent. Too dangerous!
Thanks for the coag info, though. I did not know this.
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| mani
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yes i agree, ,Y pestis is too dangerous to handle and is not usually diagnosed on the basis of labs. Clinical history is usually enough. Thnax bactiteck for ur comments
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| Ig F
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i m too bookish...i ll remember staph aureus and yerisinia pestis..lolz
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| SmokyWaters
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well staph species is the one with coagulase positivity
it incluses aureus
sheiliferi
delphini
intermedius
Y. pestis also is coagulase positive...thanks 
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