Streptococcus. Low G+C Cocci pairs/chains FA Non motile, NSF Capnophiles Catalase (-) ...
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![Page 1: Streptococcus. Low G+C Cocci pairs/chains FA Non motile, NSF Capnophiles Catalase (-) Peroxidase Hemolysins Lancefield Groups 18 antigens.](https://reader036.fdocuments.us/reader036/viewer/2022062321/56649dd95503460f94ace0e0/html5/thumbnails/1.jpg)
Streptococcus
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Streptococcus
Low G+C Cocci pairs/chains FA Non motile, NSF Capnophiles Catalase (-) Peroxidase Hemolysins Lancefield Groups
18 antigens Cell wall reactivity
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Lancefield Groups
Membrane Ag Groups A-H, K-V
Group A Strep. pyogenes
Group B Strep. agalactiae
Group C, F, G Strep equisimilis Strep zooepidemicus Strep anguinosus
Group D E. faecalis Strep bovis Strep equines
Group K Strep salivarius
Viridans Strep mutans Strep mitis Strep sanguis
Pneumococci
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Strep Virulence Factors
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GAS: Strep pyogenes Location
Skin, mm Resp: pharynx
Pathogenicity Adhesins
Protein F and S (fibronectin) Lipoteichoic acid (LTA)
Immune evasion Protein M
Binds to fibrinogen Mimics CT/Muscle
antigens Capsule (hyaluronic acid)
Proteins Streptolysins (leukocidins)
Function Lyse formed
elements Beta hemolysis
Types S = O2 stable O = O2 labile
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Strep pyogenes Enzymes
Streptokinase Break down clots
DNase B depolymerize
Hyaluronidase Proteases C5a peptidase
Decrease chemotaxis Toxins Exotoxins
Pyrogenic (A, B, C) Superantigens
Increase immune cytokines
Promote fever TSS like syndrome
Sepsis M1 and M3 strains
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Strep pyogenes infections
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Strep pyogenes diseases
Pharyngitis Scarlet Fever (rash) Skin
Pyoderma Impetigo Erysipelas Cellulitis
Strep TSS Necrotizing fasciitis Myositis Immune Mediated
Rheumatic fever Glomerulonephritis
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Necrotizing Fasciitis and Meningitis
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GBS: Strep agalactiae Epidemiology
GI Uritogenital
Pathogenicity Capsule Enzymes
Proteases Hemolysins
Beta hemolysis Hyaluronidase
Disease Puerperal fever Vaginitis UTI Endocarditis Osteomyelitis Newborn
Meningitis Sepsis Pneumonia
CAMP test
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Group C Strep
Strep equi strangles
Strep equisimilis pharyngitis
Strep anginosus abscess
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Viridans Streptococcus
Alpha hemolysis No Lancefield groups Diseases
Dental Caries Endocarditis Examples
Strep mitis Strep mutans Strep oralis Strep sanguis Strep salivarius (K)
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Biofilms
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Strep. pneumoniae
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Strep pneumonia capsule
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Strep pneumoniae
Epidemiology Mouth Upper respiratory Dz = lungs
Pathogenicity Capsule Protein A Phosphorylcholine Adhesins Proteases
Protects from IgA
pneumolysins
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Strep pneumonia diseases
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Group D Strep
Examples E. faecalis E. faecium S. bovis S. equines
Location: GI Tests
Gamma hemolysis Salt tolerant Bile tolerant
Pathogenicity Bacterocins Nosocomial
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Enterococcus Sequella
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Rapid Strep Test
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Vaccination
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Questions?