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Sarcocystis-associated encephalitis in chickens

A Mutalib1, R Keirs, W Maslin

  • 1College of Veterinary Medicine, Mississippi State University, Mississippi 39762, USA.

Avian Diseases
|April 1, 1995
PubMed
Summary

Sarcocystis-associated encephalitis caused nervous signs in chickens. This parasitic infection led to significant mortality, with limited success from common medications, but management changes showed promise.

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Area of Science:

  • Veterinary Pathology
  • Parasitology
  • Avian Medicine

Background:

  • Sarcocystis species are protozoan parasites with complex life cycles involving intermediate and definitive hosts.
  • Encephalitis in poultry can lead to significant economic losses due to neurological signs and mortality.

Observation:

  • A backyard chicken flock exhibited nervous manifestations suggestive of encephalitis.
  • Histopathology revealed necrotizing encephalitis with characteristic parasitic stages (schizonts, merozoites).
  • Immunohistochemistry confirmed Sarcocystis infection in brain lesions.

Findings:

  • The causative agent was identified as Sarcocystis through ultrastructural analysis, showing typical protozoan features.
  • Standard medications like amprolium, sulfamethazine, and chlortetracycline were ineffective in controlling mortality.

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  • Environmental management, including opossum removal and relocation to new premises, appeared to reduce mortality.

    • Implications:

    • This case highlights Sarcocystis as a potential cause of encephalitis in backyard chickens.
    • Effective control strategies may involve interrupting the parasite's life cycle and improving biosecurity.
    • Further research is needed to understand Sarcocystis transmission dynamics in avian populations.