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Streptococcus

Streptococcus

(Science: bacteria, organism) A genus of bacteria that are gram-positive cocci, often occurring in chains of varying length. Some pathogenic species produce exotoxins. In man, streptococcal species are responsible for numerous infections such as scarlet fever, tonsillitis, erysipelas (skin infection), endocarditis, rheumatic fever, glomerulonephritis, impetigo, pneumonia, meningitis, pharyngitis, lymphadenitis and wound infections. Streptococcus pneumoniae is the main culprit in lobar and bronchopneumonia.

streptococci have anti-phagocytic components (hyaluronic acid rich capsule and m protein) and release various toxins streptolysins O and s, erythrogenic toxin) and enzymes streptokinase, streptodornase, hyaluronidase and proteinase. Haemolytic streptococci (viridans streptococci) produce limited haemolysis on blood agar, include streptococcus mutans, streptococcus salivarius and streptococcus pneumoniae. Beta haemolytic streptococci, of which streptococcus pyogenes is the only species, though there are many serotypes, produce a broad zone of almost complete haemolysis on blood agar as a result of streptolysin O and S release. Alpha streptococci are nonhaemolytic (e.g. Streptococcus faecalis).


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by erangasts2
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Re: Streptococcus sanguis??

Don;t understand why you wasted so much media and time with irrelevant tests. Please determine if this isolate shows alpha hemolysis on blood agar.

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by Cepacia
Sat Dec 21, 2013 1:22 pm
 
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Streptococcus sanguis??

Hey guys have i correctly matched up my micro - organism? Gram reaction:+ Shape: cocci Acid-fast: - Spores: - Motility: - Grows in air: + Grows anaerobically: + Catalase: - Oxidase: - Acid from glucose: + OF test: : F Gas from glucose: - Acid from sucrose: + Acid from lactose: + Acid from maltose: +...

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by microbiologyhelp
Fri Dec 20, 2013 10:08 pm
 
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Topic: Streptococcus sanguis??
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Re:

I already gave you the answer in the other thread. It's beta-hemolytic streptococcus (provided that your previous post correctly identified hemolysis). Look at the links bellow: http://loudoun.nvcc.edu/vetonline/vet13 ... cocci2.gif http://img.docstoccdn.com/thumb/orig/9217067.png ...

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by microbiologyhelp
Fri Dec 20, 2013 10:07 pm
 
Forum: Microbiology
Topic: ID OF UNKNOWN?!?!
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Views: 3525

Re: Re:

I already gave you the answer in the other thread. It's beta-hemolytic streptococcus (provided that your previous post correctly identified hemolysis). Look at the links bellow: http://loudoun.nvcc.edu/vetonline/vet13 ... cocci2.gif http://img.docstoccdn.com/thumb/orig/9217067.png ...

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by microbiologyhelp
Thu Dec 12, 2013 6:12 pm
 
Forum: Microbiology
Topic: ID OF UNKNOWN?!?!
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