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[Pathogenicity of Eimeria mulardi Chauve et al., 1994 in experimentally infected mule-ducks. Precision on
C M Chauve1, J Gastellu, M C Reynaud
1Equipe Associee I.N.R.A./E.N. V. de Lyon, "Protozoaires Entericoles du Canard", Laboratoire de Parasitologie, Marcy l'Etoile, France.
Abstract:
Pathogenicity of Eimeria mulardi Chauve et al., 1994 in experimentally infected mule-ducks. Precision on pathological stages The pathogenicity of Eimeria mulardi has been studied in mule-ducklings orally inoculated with sporulated oocysts. With two dose levels (10(5) or 10(6) oocysts per bird), a significant loss of body-weight was observed, whereas no loss of weight was observed with a dose level of 10(4). With a dose of 10(6) oocysts per bird, inflammatory and haemorrhagic changes associated with obstruction mainly involving the end of the jejunum, the ileum and the caeca were seen from day 5 post-inoculation. Pathogenicity of Eimeria mulardi is due to the last generation of meronts and essentially to gamonts.
Insights
Eimeria mulardi causes significant weight loss and intestinal damage in mule-ducks at high doses. Pathogenicity stems from the parasite's later developmental stages, specifically gamonts.
Area of Science:
- Veterinary Parasitology
- Avian Pathology
- Protozoology
Context:
- Eimeria species are significant protozoan parasites affecting poultry and waterfowl.
- Eimeria mulardi specifically infects mule-ducks, causing coccidiosis.
- Understanding the pathogenicity and pathological stages is crucial for disease management.
Purpose:
- To determine the pathogenicity of Eimeria mulardi in experimentally infected mule-ducks.
- To precisely identify the pathological stages and dose-dependent effects of Eimeria mulardi infection.
- To elucidate the specific parasite life stages responsible for disease.
Summary:
- Mule-ducks experimentally infected with Eimeria mulardi showed significant body-weight loss at inoculation doses of 10^5 or 10^6 oocysts per bird.
- A dose of 10^4 oocysts did not result in weight loss.
- High doses (10^6 oocysts) induced inflammatory and hemorrhagic changes in the jejunum, ileum, and ceca from day 5 post-inoculation.
- Pathogenicity is attributed to the final meront generation and gamonts.
Impact:
- Provides precise information on Eimeria mulardi pathogenicity and dose-response in mule-ducks.
- Highlights the critical role of gamonts in Eimeria mulardi-induced disease.
- Informs veterinary strategies for controlling coccidiosis in mule-duck populations.
