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Staphylococcus aureus

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Staphylococcus aureus

  1. 1. STAPHYLOCOCCUS AUREUS
  2. 2. MORPHOLOGICALCHARACTERISTICS
  3. 3. IT IS A GRAM POSITIVE ORGANISMSAND NON- MOTILE, NON-SPORINGORGANISMS.IT IS PRESENT IN THE FORM OF BUNCHOF GRAPES BECAUSE THEY MULTIPLY INTWO PLANES AND FORM BUNCH.
  4. 4. CULTURALCHARACTERISTI CS
  5. 5. IT CAN BE GROWN ON SIMPLENUTRIENT MEDIUM WITH SOME ADDITIONOF SALT OR ON BLOOD AGAR AND ITFORMS CONVEX, ROUND, CIRCULARCOLONIES WHICH IS CREAMY INCOLOUR. THEY REQUIRE ATEMPERATURE OF 27-37*c. THEY REQUIRE A SELECTIVE MEDIUMFOR THEIR GROWTH, “ PHENOPHTHALINDIPHOSPHATE”.
  6. 6. BIO- CHEMICAL RAECTIONS
  7. 7.  THEY FERMENT SUGARS LIKE FRUCTOSE, MANNITOL. THEY CATLYSE POSITIVE REACTION IN WHICH IT CLOTS THE BLOOD BY CONVERTING FIBRINOGEN TO FIBRIN.
  8. 8. RESISTANCE
  9. 9.  IT IS A DELICATE ORGANISMS WHICH CAN BE KILLED BY PHYSICAL STERILISATION LIKE AUTOCLAVE AND CHEMICAL STERILISATION LIKE FUMIGATUION, HALOGEN AND OTHER ALDEHYDES.
  10. 10. ANTIGEN
  11. 11.  IT HAS SURFACE ANTIGEN THAT IS PRESENT ON PEPTIDOGLYCAN CELL WALL.
  12. 12. TOXINS
  13. 13.  IT PRODUCES VARIOUS TOXINS, IMPORATANT ARE:3. HEMOLYSIN: THIS IS THE TOXINS PRODUCED WHICH CAUSES DESTRUCTION OF RED BLOOD CELLS. 2. ENTEROTOXIN: IT CAUSES FOOD POISONING IN A PERSON .
  14. 14. IT CAUSES FOOD POISONING WHENTHE PERSON INTAKES FOOD WHICH ISALREADY INFECTED WITH A ORGANISMAND THIS ORGANISMS RELEASES TOXINSINTO THE MEDIUM. IT CAUSESDIARRHOEA AND VOMITTING.
  15. 15. PATHOGENICITY
  16. 16. IT CAUSES CUTANEOUS DISEASE LIKECELLULITIS, CARBUNCLE, BOIL, FRUNCLE . IT ALSO CAUSE DEEPER INFECTIONSLIKE PHARYNGITIS , TONSILITIS,BRONCHITIS AND ULTIMATELYPNEUMONIA, URINARY TRACTINFECTIONS.
  17. 17. LAB DIAGNOSIS
  18. 18.  BY GROWING THE ORGANISM ON CULTURE MEDIUM (BLOOD AGAR, SELECTIVE MEDIUM). BY TAKING SAMPLE AND EXAMINING ITS COLONIC CHARACTERISTICS.
  19. 19. EPIDEMEOLOGY
  20. 20.  STAPH. AUREUS NORMALLY RESIDES IN NOSTRILS AND INFECTION OCCURS BT TOUCHING THE CONTAMINATED FINGERS OR HANDKERCHIEF TO THE WOUND SURFACE.

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