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Related Experiment Videos

Laboratory studies with some older anticoccidials.

J F Ryley, R G Wilson

    Parasitology
    |December 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    This study re-investigated anticoccidial drug activity against Eimeria tenella. Only spiramycin showed significant coccidiocidal effects, with others requiring higher doses to inhibit parasite development.

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    Area of Science:

    • Veterinary Parasitology
    • Antiparasitic Drug Discovery
    • Poultry Health

    Background:

    • Coccidiosis, caused by Eimeria species, is a significant poultry disease.
    • Effective anticoccidial drugs are crucial for maintaining poultry health and productivity.
    • Previous studies have evaluated various anticoccidial agents with varying efficacy.

    Purpose of the Study:

    • To re-evaluate the anticoccidial activity of several established drugs against Eimeria tenella.
    • To determine the efficacy of drugs in vitro and in vivo at different stages of the parasite life cycle.
    • To compare the activity of these drugs with newer anticoccidial agents.

    Main Methods:

    • In vivo and cell culture experiments using Eimeria tenella.
    • Testing of nicarbazin, amprolium, zoalene, sulphadimidine, diaveridine, Darvisul, spiramycin, chloramphenicol, and oxytetracycline.

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  • Administration of drugs at various concentrations and timings relative to infection.

    • Main Results:

    • Spiramycin demonstrated notable coccidiocidal activity.
    • Nicarbazin and amprolium exhibited slower coccidiocidal effects.
    • Higher drug concentrations were generally required to inhibit parasite development, primarily at the first-generation schizont stage.
    • Delayed medication impacted second-generation parasites, causing tissue damage despite incomplete maturation.

    Conclusions:

    • Spiramycin is a potent anticoccidial agent against Eimeria tenella.
    • The efficacy of many anticoccidials is dose-dependent and stage-specific.
    • Methodological considerations are important when evaluating anticoccidial drug efficacy.