Canis ISSN: 2398-2942

Pythium insidiosum

Synonym(s): Hyphomyces destruens

Contributor(s): Vetstream Ltd

Introduction

Classification

Taxonomy

  • Aquatic micro-organism, fungus.

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Clinical Effects

Epidemiology

Habitat

  • Found in aqueous environments.

Lifecycle

  • Reproduces asexually in aqueous environment to form motile zoospores which infect the host.
  • Reproduces sexually on solid substrates via male antheridia and female oogonia.

Transmission

  • Animals infected by standing in or drinking water infected with zoospores.

Pathological effects

  • Causes cutaneous pythiosis (swamp cancer or Florida horse leeches).
  • Skin lesions are pyogranulomatous or fibrogranulomatous.
  • Disease is chronic and progressive. In horse lesions <45 cm, discharging swellings.
  • Lesions usually on ventral trunk, head or extremities.
  • Nasal mucosa may be involved.
  • Hyphae can be found within granulomatous coagula ('leeches').
  • Dogs can also have intestinal form; more rarely systemic.
  • Recently reported as cause of intraprostatic infection.

Control

Control via animal

Surgery

  • Excise affected tissue.

Control via chemotherapies

Diagnosis

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Further Reading

Publications

Refereed papers

  • Recent references from VetMedResource and PubMed.
  • Jaeger G H, Rotstein D S & Law J M (2002) Prostatic pythiosis in a dog. J Vet Intern Med 16, 598 - 602.
  • Bentinck-Smith J et al (1989) Canine phythiosis - isolation and identification of Pythium insidiosum. J Vet Diag Inv 1, 295.
  • Foil C S O et al (1984) A report of subcutaneous phythiosis in 5 dogs and a review of the etiologic agent Pythium spp. JAAHA 20, 959.
  • Howerth E W et al (1989) Subcutaneous pythiosis in a dog. J Vet Diag Inv 1, 81.

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