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
What species does s. Aureus subspecies aureus infect?
Cattle, swine, horse, sheep, dog and poultry
(Biotype A-E in different hosts)
MRSA: methicillin resistant s. Aureus
What species does s. Aureus subspecies anaerobius target and what disease does it cause?
Sheep
Morel disease
Target species and disease s. Pseudointermedius ?
Dog, cat
Dermatitis, otitis externa
Target species s. Intermedius
Dog, horse, birds: mucous membranes
Saprophyte
Coagulase negative species:
S. Epidermis S. Haemolyticus S. Hyicus S. Gallinarum S. Equorum S. Felis
S. Epidermis target species and disease?
Horse and dog
Wound infection
S. Hemolyticus found in ?
Milk
S. Hyicus
A part of the strain is coagulase positive
Exudative epidermitis
S. Gallinarum cause?
Dermatitis
S. Equorum cause?
Dermatitis
S. Felis cause?
Dermatitis
Habitat Micrococcus?
Environment, mucous membranes, food, skin
Morphology Micrococcus?
Coccus
Biochem Micrococcus?
Glucose utilization is aerobic or missing
Pathogenicity Micrococcus?
Saprophyte