IIA. Systemic Bacteriology | 6. Actinomyces, Bifidobacterium, Eubacterium. Flashcards
I. Eubacterium
1. Give a summary of Eubacterium
- G +, anaerobe
- present in oral cavity, plaque
- Periodontal disease
- Amoxicillin
I. Eubacterium
2. Describe morphology of Eubacterium?
- pleomorphic, Gram-variable rods or filaments
- Gram-positive bacilli
I. Eubacterium
3. Site of infections of Eubacterium
main intraoral sites and infections: plaque biofilms and calculus; implicated in caries and periodontal disease
I. Eubacterium
4. Give an example of Eubacterium
- E. yurii is involved in ‘corn-cob‘ formation in dental plaque
- Eubacterium Lentum has been linked to endocarditis
II. Actinomyces
1. What are the features of Actinomyces?
- non-acid-fast, Gram-positive bacterium
- is anaerobic
II. Actinomyces
2. Where are Actinomyces found?
found as a commensal organism in dental plaque and female genital tract
II. Actinomyces
3. How do Actinomyces infect?
- causes granulation tissues
- form sinus tracts to the surface
-> exudate from these sinus tracts contains hard microcolonies called sulphur granules
II. Actinomyces
4A. What are the diseases caused by Actinomyces?
II. Actinomyces
4B. What is the feature of cervicofacial actinomycosis?
cervicofacial actinomycosis (lumpy jaw)
=> after dental work is performed
II. Actinomyces
4B. What is the feature of thoracic actinomycosis?
lung and ribs
II. Actinomyces
4C. What is the feature of abdominal actinomycosis?
starts in the ileocecal region and frequently produces sinus tract to the skin surface
II. Actinomyces
4D. What is the feature of mycetoma?
mycetoma
-> infection of the limb
II. Actinomyces
4D. What is the feature of abdominal actinomycosis?
mycetoma
-> infection of the limb
II. Actinomyces
5. What is the treatment for Actinomyces
- surgical drainage of necrotic tissues
- penicillin
II. Actinomyces
6. Explain Actinomyces based on this picture
III. Bifidobacterium
1. What are the features of Bifidobacterium?
8 species : B. dentium
III. Bifidobacterium
2. What is the morphology of Bifidobacterium?
Morphology: G+ rods, filamentous form
III. Bifidobacterium
3. How should we culture Bifidobacterium?
Culture: blood agar, anaerobic
III. Bifidobacterium
4. Where can we find Bifidobacterium?
Normal flora in oral cavity, intestinal tract of babies
III. Bifidobacterium
5. What are the diseases and probiotics for Bifidobacterium
- Probiotics – help perform normal function i.e. digestion and ward off pathogenic microbes
- Disease: caries? Periodontitis? pathogen in immunosuppressed state
