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Streptococci are members of the normal flora. Virulence factors of group A streptococci include (1) M protein and lipoteichoic acid for attachment; (2) a hyaluronic acid capsule that inhibits phagocytosis; (3) other extracellular products, such as pyrogenic (erythrogenic) toxin, which causes the rash of scarlet fever; and (4) streptokinase, streptodornase (DNase B), and streptolysins. Some strains are nephritogenic. Immune-mediated sequelae do not reflect dissemination of bacteria. Nongroup A strains have no defined virulence factors. In humans, diseases associated with the streptococci occur chiefly in the respiratory tract, bloodstream, or as skin infections. [https://www.ncbi.nlm.nih.gov/books/NBK7611/]
The genus Streptococcus , a heterogeneous group of Gram-positive bacteria, has broad significance in medicine and industry. Various streptococci are important ecologically as part of the normal microbial flora of animals and humans; some can also cause diseases that range from subacute to acute or even chronic. Among the significant human diseases attributable to streptococci are scarlet fever, rheumatic heart disease, glomerulonephritis, and pneumococcal pneumonia. Streptococci are essential in industrial and dairy processes and as indicators of pollution. [https://www.ncbi.nlm.nih.gov/books/NBK7611/]
Dubourg, G., Lagier, J. C., Armougom, F., Robert, C., Hamad, I., Brouqui, P., & Raoult, D. (2013). The gut microbiota of a patient with resistant tuberculosis is more comprehensively studied by culturomics than by metagenomics. European Journal of Clinical Microbiology & Infectious Diseases: Official Publication of the European Society of Clinical Microbiology, 32(5), 637–645.
Lineage | Physiology | General | Growth Tolerances | Hydrol./digest./degr. |
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Health:
Negative
Source: human faeces, raw milk, and cows
DNA G+C(%): 34.8-36.5
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Opt. T: 35-37℃
NaCl 3-5%: 4(+)
NaCl >6%: 6.5(d)
pH >8: 9.6(neg)
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Monosaccharide O/F | Oligosaccharide O/F | Polysaccharide O/F | Polyol O/F | Other O/F |
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Monosaccharide util/assim | Oligosaccharide util/assim | Other carboh. util/assim | Amino acid util/assim | Organic acid util/assim |
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Enzymes: General | Enzymes: Carbohydrate | Enzymes: Protein | Enzymes: Arylamidases | Enzymes: Esters/fats |
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Fuel | Usable Metabolites | Metabolites Released | Special Products | Compounds Produced |
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