تويت
Streptococcus agalactiae : Group B,Beta hemolysis Streptococcus Group of bacteria gram positive cocci .Characteristics
Habitat
Transmission
Pathogenesis
Diseases
Laboratory Identification
- Gr + Ve cocci in chain .
- Non Sporing , Non Motile Cocci .
- Facultative anaerobic .
- capsule(polysaccharide)
- the surface protein (C protein)
Habitat
- Normal Vaginal ( 25% ) & Oral flora .
Transmission
- Direct Contact
Pathogenesis
- Virulance factors not clearly Identified .
- Capsule is major virulence factor if it is present ”Antiphagocytosis” .
Diseases
- Neonatal Meningitis .
- Septicaemia
- Septic abortion .
- Pneumonia.
Laboratory Identification
- Colonies on blood agar larger than S.pyogenes .
- The colonies are buttery a narrow zone of Bhemolytic.
- Colonies surrounded by Beta Hemolysis.
- Catalase –Ve
- Bacitracin Sensitive .
- CAMP test +Ve
- Hippurate hydrolysis +Ve.
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