ISSN 2398-2942      

Pythium insidiosum

icanis
Contributor(s):

Vetstream Ltd

Synonym(s): Hyphomyces destruens


Introduction

Classification

Taxonomy

  • Aquatic micro-organism, fungus.

Active Forms

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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 PubMed and VetMedResource.
  • Jaeger G H, Rotstein D S & Law J M (2002) Prostatic pythiosis in a dog. J Vet Intern Med 16 (5), 598-602 PubMed.
  • Bentinck-Smith J, Padhye A A, Maslin W R et al (1989) Canine phythiosis--isolation and identification of Pythium insidiosum. J Vet Diag Inv (4), 295-298 PubMed.
  • Howerth E W, Brown C C, Crowder C (1989) Subcutaneous pythiosis in a dog. J Vet Diag Inv (1), 81-83 PubMed.
  • Foil C S O, Short B G, Fadok V A et al (1984) A report of subcutaneous pythiosis​ in five dogs and a review of the etiologic agent Pythium spp. JAAHA 20 (6), 959-966 VetMedResource.

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