Filamentous Bacteria - Exam 2 Flashcards
What is the most common species of Nocardia?
Nocardia asteroides
What is the generalized pathogenesis of Nocardia?
Generalized suppurative and pyogranulomatous process
Who is most susceptible to Nocardia?
Immunosuppressed and massively exposed individuals
Which structure is consistently involved with Nocardia infection?
Lymph nodes
Which filamentous bacteria is associated with bovine farcy?
Nocardia
Which filamentous bacteria has been identified as the causative agent of mandibular osteomyelitis (lumpy jaw) in cats?
Norcardia cyriacigeorgica
How would you control the spread of Nocardia?
Removal of infected animals
Disinfection of premises and equipment
Scrupulous stabling and milking hygiene
What is the reservoir for Actinomyces?
Found on oral mucous membranes, tooth surfaces and mucous membranes of the urogenital tract and secondarily GIT
Endogenous infection
What kind of reactions do actinomyces evoke?
Pyogranulomatous reactions
What is the condition Actinomyces causes in ruminants?
Lumpy jaw!
How do the lesions of Nocardia and Actinomyces differ?
Actinomyces lesion expands but has little tendecy for vascular dissemination
Difference to Nocardiosis
Which filamentous bacteria causes cervical lymphadentis in horses?
Actinomyces
Would be lower on DDx
(similar to S. equi subs. equi)
Which filamentous bacteria is the most common agent for infection of dog and cat bites?
Actinomyces viscosus
What are the characteristics for diagnosis of Actinomyces?
Sulfur granules
Crushed granules, exudate or tissue impressions are stained - Gram-positive diphteroids, non-acid fast, majority are catalase negative
Which type of filamentous bacteria causes dermatophilosis or streptothricosis in cattle?
Dermatophilus congolensis
Which filamentous bacteria causes rain scald, ran rot or grease heal in horses?
Dermatophilus congolensis
Which filamentous bacteria causes strawberry footrot and lumpy wool in sheep?
Dermatophilus congolensis
What is the disease pattern for Dermatophilus in livestock?
Creates an exudative epidermitis
What stain is used for Dermatophilus congolensis?
Giemsa stain
What other filamentous bacteria was listed in the powerpoint but not elaborated on?
Streptobacillus
