45. Genera Renibacterium and Rhodococcus.

Question 1

Renibacterium habitat morphology staining?

Answer 1

RENIBACTERIUM
Renibacterium salmoninarum
1. Habitat:
• water, fish
2. Morphology:
• 1-1.5 µm rods, short chains
3. Staining:
• Gram-positive

Question 2

Renibacterium Culture and pathogenecity?

Answer 2

4. Culture:
• aerobic,
• 15-18 oC,
• fastidious
• cystein and serum needed
5. Pathogenicity:
• obligate pathogenic, intra cellular
• salmon, trout:
• abscesses in kidneys and other organs

Question 3

Habitat Morphology and staining Rhodococcus r.equi?

Answer 3

RHODOCOCCUS R. equi

1. Habitat: • soil, plant, gut (horse)

2. Morphology: • coccus-rod cycle, • capsule
3. Staining: • Gram-positive, • some acid-fast

Question 4

Rhodococcus culture?

Answer 4

4. Culture: • simple • nutrient agar, nutrient broth • pigment (pink), • capsule

Question 5

Rhodoccus pathogenecity?

Answer 5

5. Pathogenicity:
   • intra cellular pathogen
   • virulence factor
   • VapA protein: plasmid coded, more virulent
   • VapB protein: plasmid coded, less virulent
   • foal:pneumonia, abscesses in the lungs,
   • inflammation of the gut wall
   • cattle, swine: mesentheric lymph nodes, abscesses
   • human: pneumonia (immunosuppression, AIDS)