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New data on Echinococcus spp. in Southern Brazil.

Mário L de la Rue1, Anke Dinkel, Ute Mackenstedt

  • 1Depto. de Microbiologia e Parasitologia, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil. delarue@smail.ufsm.br

Revista Do Instituto De Medicina Tropical De Sao Paulo
|May 16, 2006
PubMed
Summary

Genetic analysis of Echinococcus isolates in Brazil revealed predominantly the sheep strain (G1) of Echinococcus granulosus. Two isolates identified as Echinococcus ortleppi (cattle strain G5) have significant implications for disease control strategies.

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Area of Science:

  • Veterinary Parasitology
  • Molecular Epidemiology
  • Public Health

Background:

  • Echinococcus granulosus is a globally significant zoonotic parasite causing cystic echinococcosis.
  • The Echinococcus granulosus complex comprises multiple genetically distinct strains with varying host specificities and epidemiological behaviors.
  • Understanding the genetic diversity of Echinococcus isolates is crucial for effective disease control.

Purpose of the Study:

  • To genetically characterize Echinococcus isolates from livestock in Southern Brazil.
  • To determine the prevalence of different Echinococcus granulosus complex taxa in the region.
  • To inform public health strategies based on identified parasite strains.

Main Methods:

  • DNA extraction from 40 Echinococcus isolates obtained from sheep and cattle.

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  • Polymerase Chain Reaction (PCR) amplification of mitochondrial cytochrome c oxidase subunit 1 (CO1) gene.
  • DNA sequencing of the CO1 gene for precise genetic identification.

    • Main Results:

    • Thirty-eight out of 40 isolates were identified as the sheep strain (G1) of Echinococcus granulosus.
    • Two isolates were identified as Echinococcus ortleppi, previously classified as the cattle strain (G5).
    • This represents the first molecular identification of E. ortleppi in cattle from this region.

    Conclusions:

    • The study highlights the predominance of the sheep strain (G1) in Southern Brazil, but also confirms the presence of Echinococcus ortleppi.
    • The shorter prepatent period of E. ortleppi in dogs necessitates targeted control measures.
    • Findings have direct implications for designing and implementing effective Echinococcus control programs in endemic areas.