1 / 21

Streptococci

Streptococci. Colonial morphology Microscopic appearance Lancefield grouping - How to distinguish between Streptococci. Streptococci. Streptococcus pneumoniae. Streptococcus pneumoniae.

ermin
Télécharger la présentation

Streptococci

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Streptococci Colonial morphology Microscopic appearance Lancefield grouping - How to distinguish between Streptococci

  2. Streptococci

  3. Streptococcuspneumoniae

  4. Streptococcuspneumoniae

  5. - On Blood Agar: Translucent or mucoid colonies, 1-2 mm in diameter, raised colonies in young cultures but later become flattened with raised edges.

  6. Bile Solubility Test

  7. Optochin Test

  8. Streptococcuspyogenes - On Blood Agar: small 0.5 – 1 mm in diameter colourless colonies, dry, shiny or mucoid beta haemolytic colonies.

  9. Streptococcusagalactiae

  10. - On Blood Agar: grey mucoid colonies, 2mm in diameter surrounded by small zone of Beta-haemolysis.

  11. CAMP Test - 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.

  12. Enterococcusfaecalis

  13. On Blood Agar: non-haemolytic colonies.

  14. Aesculinis incorporated into agar with ferric citrate and bile salts • bile aesculin agar. • Hydrolysis of the aesculin forms aesculetinand glucose. • The aesculetin forms dark brown or black complexes with ferric citrate.

More Related