Can Corynebacterium be catalase negative?

All potentially toxigenic corynebacteria are catalase positive and for non-toxigenic Corynebacterium species, the catalase test results are varied. All potentially toxigenic corynebacteria (C. diphtheriae, C.

Is Corynebacterium catalase positive or negative?

The principal features of the genus Corynebacterium were described by Collins and Cummins in 1986. They are gram-positive, catalase-positive, non-spore-forming, non-motile, rod-shaped bacteria that are straight or slightly curved.

Is Corynebacterium spp Gram-positive or negative?

Corynebacteria are Gram-positive, club-shaped bacilli, members of the Actinobacteria.

How can you tell Corynebacterium spp?

Basic tests for Corynebacteria identification include Gram staining and cell morphology, size, pigmentation, odour and haemolysis of colonies, CAMP reaction, lipophilia, motility and biochemical tests such as catalase and pyrazinamidase production, nitrate reduction, urea hydrolysis, esculin hydrolysis, acid production …

What are the symptoms of Corynebacterium Diphtheriae?


  • A thick, gray membrane covering your throat and tonsils.
  • A sore throat and hoarseness.
  • Swollen glands (enlarged lymph nodes) in your neck.
  • Difficulty breathing or rapid breathing.
  • Nasal discharge.
  • Fever and chills.
  • Tiredness.

At what site is Corynebacterium normally found?

They are ubiquitous and can be found on the skin and in the upper respiratory and gastrointestinal tracts. The primary pathogen in this group is Corynebacterium diphtheriae, the etiologic agent of diphtheria.

What are the symptoms of Corynebacterium?

What are catalase-positive Gram positive bacilli called?

Catalase-positive Gram-positive bacilli, commonly called “diphtheroids” or “coryneform” bacteria were historically nearly always dismissed as contaminants when recovered from patients, but increasingly have been implicated as the cause of significant infections. These taxa have been underreported, and the taxa were taxonomically confusing.

How are Corynebacterium and Rhodococcus equi related?

Corynebacterium species and Rhodococcus equi. Chapter 9. The Corynebacterium species belong to the Corynebacteriaceae family of the Actinomycetales order. They are small, short, pleomorphic Gram-positive rods (about 0.5 µm in width) that occur in rod, coccoid and club-shaped forms.

Which is the best description of Corynebacterium species?

Corynebacterium species and coryneforms: an update on taxonomy and diseases attributed to these taxa. Clin. Microbiol. Newsl. 27:9–18.

What kind of disease can Corynebacterium kutscheri cause?

Corynebacterium kutscheri is a commensal of the upper respiratory and intestinal tracts of laboratory rodents. Infection is usually subclinical in mice and rats. However, when immunosuppressed, a pseudotuberculosis with high morbidity and mortality can appear in these animals.