Common Bacteria Notes

O2 require Name ment Morphology Virulence factor Facultative anaerobic Streptococcus * Gram +ve * Catalase -ve * Oxidase -ve * Spherical * Small/pin-point * Streptolysin (hemolysis), * fibrinolysin * hyaluronidase colonies Transmission (S. pyogenes) Faculttive anaerobic aureus Staphylococcus * Catalase +ve * Coagulase +ve * Spherical spreading factor * Fibrinolysin - allows spreading anthracis Aerobic Bacillus Mostly endogenous * Bovine: mastitis * Necrotoxin - * Lamb: pyaemia * Poultry: "Bumblefoot" (chronic arthritis) dermonecrosis * Enterotoxin * Leucocidin by polychrome metheylene blue * Ingestion of contaminated feed * Factor II (protective (spores) * Inhalation of antigen) spores * collapsing, convulsion, rectal, nasal bleeding & septicaemia death in few min * Rapid decompose & bloat * Dark blood, poor clot, orificial bleeding Treatment & Prevention * penicillin * Topical application with mild antiseptics Remarks Bhemolytic (complete) species: * Management: cleanliness, pathogenic disinfection of animal environment & equipment * Pyogenic infection * Botryomycosis - chronic granulomatous lesions in udders and spermatic cord Sample collection Aspirates from acute gastroenteritis unopened * Haemolysin * Large G+ve rods * Spores (exposure to ait, depleted nutrients); * capsule (inside) - * Factor I (oedema factor) pink Diagnosis * pyogenic infections Natural habitats * Bovine mastitis - S. - agalactiae, S. dysagalactiae, S. uberis, skin, upper resp S. tract, urogenital tract zooepidemicus * Strangles in foals - S. equi * Coagulase protect from phagocytosis * Hyaluronidase * Gram +ve Signs lesions * Drain abscess * Only for * Topical application of mild Staph: ahemolysis antiseptics = * A/biotics: resistant to complete penicillin G, streptomycin & * MRSA & tetracycline VRSA * Exposure to airspores develop * Precipitin test known as * Vaccination * penicillins (no effect Ascoli test. on * FAT. antiserum biological labelled preformed toxins) with fluorescein * eradicate carriers warfare 

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