Module Three Gram Positive Rods and Filaments

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Module Three Gram Positive Rods and Filaments Lesson one a Corynebacterium and Eubacterium

Lesson one b Eubacterium

Lesson one c Rhodococcus

Lesson two The Actinomycetes

Lesson three a Listeria

Lesson three c Bacillus

GENUS CORYNEBACTERIUM

Key Points:

Changes in Nomenclature

Previous Name

Species:

Differentiation of the Corynebacteria

Differentiation of bacteria in the Corynebacteria renale group

Diagnostic Procedures

Colonial characteristics

Aerobic or anaerobic incubation requirements

Specific results for distinguishing members of the C. renale group

Clinical Infections

Corynebacterium renale group: Corynebacterium renale, Corynebacterium pilosum, and Corynebacterium cystitidis

Morphology and Staining Reactions

Cultural and Biochemical Properties

Epizootiology and Pathogenesis

· Distinctive Features of the organisms

Diagnosis

Antimicrobial Susceptibility

LESSON one b

Morphology and Staining Reactions

Cultural and Biochemical Features

Epizootiology and Pathogenesis

Diagnosis

Treatment

LESSON one c

Key points

Epizootiology and Pathogenesis

Diagnosis

Clinical conditions associated with Rhodococcus

LESSON TWO

Key points

Dermatophilus congolensis

Differentiation of the Genera

Comparative features of actinomycetes of veterinary importance

ACTINOMYCES, ARCANOBACTERIUM AND ACTIBACULUM SPECIES

Diagnostic Procedures

· Identification criteria for isolates:

Antimicrobial susceptibility

Disease conditions produced by Actinomyces, Arcanobacterium and Actinobaculum species in domestic animals

Differentiation of Nocardia species

Differentiation of Nocardia asteroids and Actinomyces viscosus

Diagnostic Procedures

Identification criteria for isolates:

Treatment

Disease conditions produced by Nocardia species in domestic animals

Pathogenesis and Pathogenicity

Lumpy wool

Streptotrichosis

Strawberry foot-rot in sheep

Diagnostic Procedures

Treatment

Review Questions:

LESSON Three a GENUS LISTERIA

Key points

Differentiation of Listeria species

Laboratory methods for differentiating Listeria species

Treatment

Clinical manifestations of infections with Listeria species in domestic animals

GENUS ERYSIPELOTHRIX

E. rhusiopathiae

Key points

Definitive identification of E. rhusiopathiae

Biochemical reactions

Pathogenesis and Pathogenicity

Diagnosis

Main hosts and diseases of Erysipelothrix rhusiopathiae

GENUS BACILLUS

Key points

Species:

Sporangium (mother cell)

Differentiating features of Bacillus anthracis and B. cereus

B anthracis causes anthrax

Morphology and Staining Reactions

Cultural and Biochemical Features

Resistance

Epizootiology and Pathogenesis

Diagnosis

Treatment

Disposal of Carcasses Infected with Anthrax

Review Questions:

Overview

The document serves as an educational resource on Gram-positive rods and filaments, primarily focusing on their biological characteristics, pathogenic potential, and the clinical implications for animal health. It includes identification criteria, cultural and biochemical properties, and treatment options.

Key Points

1Corynebacterium exhibits a unique coryneform morphology
2Eubacterium can cause cystitis and pyelonephritis in pigs
3Rhodococcus is a significant respiratory pathogen in foals
4Pathogenic corynebacteria often require tissue trauma for infection establishment
5Diagnosis involves direct microscopy and culture on specific media

Details

Category: Biology and Natural Sciences

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