Flashcards in Actinomycetes Deck (21)
Identify the partially-acid-fast positive genera of Actinomycetes.
Identify the partially-acid-fast negative genera of Actinomycetes.
List three aerobic actinomycetes.
List one anaerobic actinomycetes.
How do we differentiate Nocardia from Actinomyces & streptomyces?
Actinomyces & streptomyces- blue
Nocardia causes infections primarily in what kind of patients?
Which organism causes pulmonary infection in immunocompromised patients?
The cutaneous infections which is usually from traumatic inoculation is caused by_______
Cutaneous infections-Traumatic inoculation may develop into _______
List the major illnesses observed in infections related to Nocardia
-dissemination to brain
- cutaneous infections-traumatic inoculation
Which organism has high mortality?
Describe the microscopic appearance of Nocardia.
Beaded, branching, filamentous GPRs.
Describe the plate morphology of Nocardia.
-often resemble fungi
-has dry, heaped, white to orange, aerial hyphae
What is the preferred method used for identifying Nocardia?
Describe the methods for speciation in identifying Nocardia.
-speciation using hydrolysis of casein, xanthine, tyrosine, or hypoxanthine
- Looking for hydrolysis (+) vs no hydrolysis (-)
This organism has negative hydrolysis of casein, xanthine, tyrosine or hypoxanthine.
This organism has casein and tyrosine hydrolysis- Positive
Can we differentiate Streptomyces from Nocardia on gram stain?
Describe the microscopic appearance of Streptomyces.
GPRs or filamentous, may be beaded
This organism is rare in human infections and commercial uses antibiotics, antifungals, and immunosuppressants.
Streptomyces- primarily saprophytes