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Concurrent infections with reoviruses and coccidia in broilers.

M D Ruff, J K Rosenberger

    Avian Diseases
    |April 1, 1985
    PubMed
    Summary

    Coccidia and reovirus coinfections in poultry significantly worsen weight loss and leg problems, especially with severe reovirus strains. Early coccidiosis may also enhance reovirus infections.

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    Area of Science:

    • Poultry Health
    • Infectious Diseases
    • Parasitology
    • Virology

    Background:

    • Coccidiosis and reovirus infections are significant poultry diseases.
    • Understanding their interactions is crucial for disease management.

    Purpose of the Study:

    • To investigate the interactive effects of coccidia (Eimeria acervulina, E. mitis) and reovirus strains on poultry health.
    • To assess the impact on weight gain, physiological parameters, and lesion development.

    Main Methods:

    • Experimental inoculation of poultry with varying doses of coccidia and reovirus strains.
    • Monitoring weight gain, plasma pigment and protein levels.
    • Assessing lesion scores, oocyst production, and incidence of secondary conditions like swollen hocks.

    Main Results:

    • High doses of coccidia alone depressed weight gain, plasma pigment, and protein.
    • Coinfection with reoviruses (especially severe strains 2035 and 2408) exacerbated weight gain depression.
    • Swollen hocks significantly increased in combined infections with coccidia and reovirus 2035.
    • Reovirus 2408 slightly impaired coccidial immunity; early coccidiosis potentially increased reovirus tissue infectivity.

    Conclusions:

    • Coccidia and reovirus coinfections have synergistic negative impacts on poultry health, particularly affecting weight gain and leg integrity.
    • Specific reovirus strains can worsen coccidiosis outcomes and interfere with immunity.
    • Further research is warranted on the complex interplay between these pathogens.

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