Streptococci. Colonial morphology Microscopic appearance Lancefield grouping - How to distinguish between Streptococci. Streptococci. Streptococcus pneumoniae. Streptococcus pneumoniae.
- How to distinguish between
- On Blood Agar: Translucent or mucoid colonies, 1-2 mm in diameter, raised colonies in young cultures but later become flattened with raised edges.
- On Blood Agar: small 0.5 – 1 mm in diameter colourless colonies, dry, shiny or mucoid beta haemolytic colonies.
- On Blood Agar: grey mucoid colonies, 2mm in diameter surrounded by small zone of Beta-haemolysis.
- CAMP factor is an extracelluar diffusible protein produced by S.agalactiae
- This protein interacts with the staphylococcal beta-lysin on sheep blood agar producing enhanced haemolysis.
- arrow-head shaped area of haemolysis where the staphylococcal organism meets the test organism.
On Blood Agar: non-haemolytic colonies.