Lab 3- Staphylococcus Flashcards
Habitat
Skin, mucous membrane, food, plant, soil and water
Morphology
Coccus
Bunch of grapes
Staining
Gram positive
Steps of gram staining
Crystal violet 3-5 min Lugol solution 1-1,5 min 96% alcohol, some drops Water Fuchsin 0,5-1 min Water Drying
Culture
Nutrient agar, broth
Pigment
Golden, white
Hemolysis
B hemolysis (sometimes double) No hemolysis
Selective culture
10% NaCl-mannitol-phenol red agar
Må-tellurite-glycine-pyruvic acid - egg (Baird-Parker agar)
Biochem
Catalase +
Oxidase -
Fermentative
Extracellular enzymes:
Coagulase, fibrinolysin, hyaluronidase
Surface proteins: protein-A
Toxins:
haemolysis, leucocidins, enterotoxins, dermotoxin (exfolitative toxin)
Antigens
Complex
Resistance
Good
Pathogenicity
Local suppuration, abscesses, arthritis, mastitis, metritis, dermatitis, septicaemia
Species
Coagulase positive
Extracellular enzymes Toxins Hemolysis Mannitol + Facultative pathogens
Species
Coagulase negative
Less extracellular enzymes Toxin prod. Not typical No hemolysis Mannitol - Generally saprophytes, sometimes subclinical infections
Coagulase positive species:
S. Aureus subspecies aureus
S. Aureus subspecies anaerobius
S. Pseudointermedius
S. Intermedius