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Tick paralysis in Brazil.

N M Serra Freire

    Tropical Animal Health and Production
    |May 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    This study details the toxic effects of Amblyomma cajennense ticks on livestock in Brazil. It confirms tick paralysis caused by all life stages, presenting uniquely in affected animals.

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    Area of Science:

    • Veterinary Toxicology
    • Parasitology
    • Animal Neurology

    Background:

    • Amblyomma cajennense is a tick species found in South America.
    • Tick paralysis is a neurological condition caused by toxins secreted by certain ticks.
    • Previous reports on tick paralysis have not detailed its occurrence in Brazil or involvement of all A. cajennense developmental stages.

    Purpose of the Study:

    • To investigate the toxic effects of Amblyomma cajennense on cattle, sheep, and goats.
    • To document the clinical presentation of tick paralysis in Brazil.
    • To determine if all developmental stages of A. cajennense can induce paralysis.

    Main Methods:

    • Observational study of natural infections in livestock from July-December 1977 and June-November 1978.

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  • Experimental confirmation of toxic effects and paralysis induction.
  • Clinical and neurological examination of affected animals.

    • Main Results:

    • Locomotor disturbances, starting as hind-limb paralysis, were observed.
    • Paralysis ascended to affect upper nervous centers.
    • Tick paralysis was confirmed experimentally and observed in natural infections.
    • This represents the first report of tick paralysis in Brazil.
    • A novel clinical manifestation of tick paralysis was documented.
    • All developmental stages of A. cajennense were found to induce paralysis.

    Conclusions:

    • Amblyomma cajennense poses a significant toxicological threat to livestock in Brazil.
    • The study provides the first evidence of tick paralysis in Brazil, induced by all A. cajennense life stages.
    • The clinical presentation of tick paralysis in Brazil differs from previously described forms.