46. Genera Nocardia and Dermatophilus.

Question 1

Dermatophillus Habitat?

Answer 1

DERMATOPHILUS D. congolensis

1. Habitat: • soil, skin

Question 2

Morphology of Dermatophilus?

Answer 2

Morphology: • coccoid - filaments

Question 3

Staining Dermatophillus?

Answer 3

Staining: • Gram-positive

Question 4

Dermatophillus Culture?

Answer 4

4. Culture:

• aerobic • fastidious • blood agar • propagation • flagellated coccus (zoospora) • filaments - branching - growth • transverse and longitudinal divisions - segments

Question 5

Dermatophillus Biochemistry?

Answer 5

Biochemistry:

• proteolytic, proteases (virulence factors)
• poorly saccharolytic

Question 6

Dermatophillus Pathogenecity?

Answer 6

Pathogenicity:

• exudative dermatitis
• sheep, cattle, human

Question 7

Streptomyces habitat

Answer 7

STREPTOMYCES

1. Habitat: • soil
2. Morphology: • large, branched filaments
3. Staining: • Gram-positive Species:

• S. griseus: streptomycin

• S. fradiae: neomycin

• S. rimosus: oxytetracyclin

• S. venezuelae: chloramphenicol

Question 8

Nocardia Habitat Morphology and staining?

Answer 8

NOCARDIA

1. Habitat: • soil
2. Morphology: • long, branched filaments • cell wall: mycolic acids
3. Staining: • Gram-positive, • irregular staining, • slightly acid fast

Question 9

Nocardia Culture?

Answer 9

4. Culture:

• obligate aerobic,
• carotenoid pigment is produced (yellow, red, pink) • aerial filaments
• replication: fragmentation of filaments

Question 10

Nocardia Pathogenecity?

Answer 10

5. Pathogenicity:
   • facultative pathogens,
   • local lesions,
   • N. asteroides:
   • cattle
   • chronic suppuration,
   • skin, subcutaneous tissues
   • mastitis
   • dog
   • generalised nocardiosis