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Dictionary » S » Streptococcus StreptococcusStreptococcus (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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Results from our forumIdentifying unknown... on the gram negative bacteria. The only gram positive bacteria (that I know of) that is indole positive is Enterococcus faecalis (also called Streptococcus faecalis) and as other Strep bacteria they are catalase negative. However, if your bacteria are bacilli then your gram stain is most likely ...
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Streptococcus pyogensIs Streptococcus pyogenes normal microbiota? If it is, where? Upper respiratory, nasal?
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Streptococcus hydrogen peroxidaseThis is probably a very stupid question but I'm just trying to figure out the relationship between bacteria and chronic granulomatous disease and i know that staphylococcus is hydrogen peroxidase consuming but what i wanted to confirm is, are streptococci hydrogen peroxidase producing?
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Gram positive cocci media... the katalase test you can tell if you have determined a Staphylococcus aureus, a coagulase negative Staphylococcus or other gram + species such as Streptococcus. If you want to know if you are dealing with a Staphylococcus epidermidis you need to do some biochemical tests. You have special systems ...
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