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Co-infections of the cestode Echinococcus vogeli and the nematode Calodium hepaticum in the hystricomorphic rodent Agouti paca from a forest reserve in Acre, Brazil

Published online by Cambridge University Press:  17 October 2012

F. Almeida ,
R. Caldas ,
C. Corrêa ,
R. Rodrigues-Silva ,
N. Siqueira  and
J.R. Machado-Silva
F. Almeida
Affiliation:
Laboratório de Helmintos Parasitos de Vertebrados, Instituto Oswaldo Cruz (IOC), Fundação Oswaldo Cruz (FIOCRUZ), Avenida Brasil 4365, Manguinhos, Rio de Janeiro, 21040-900, Brasil
R. Caldas
Affiliation:
Serviço de Zoonoses, Instituto de Pesquisa Clínica Evandro Chagas (IPEC), Fundação Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, Brasil
C. Corrêa
Affiliation:
Laboratório de Patologia Experimental, Departamento de Ciências Biomédicas, Universidade Gama Filho, Rio de Janeiro, Brasil
R. Rodrigues-Silva*
Affiliation:
Laboratório de Helmintos Parasitos de Vertebrados, Instituto Oswaldo Cruz (IOC), Fundação Oswaldo Cruz (FIOCRUZ), Avenida Brasil 4365, Manguinhos, Rio de Janeiro, 21040-900, Brasil
N. Siqueira
Affiliation:
Fundação Hospital Estadual do Acre e Universidade Federal do Acre, Acre, Brasil
J.R. Machado-Silva
Affiliation:
Laboratório Romero Lascasas Porto, Departamento de Microbiologia, Imunologia e Parasitologia, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, Brasil
*
*Fax: +55-021–25621511 E-mail: rsilva@ioc.fiocruz.br
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Abstract

The helminth fauna of Agouti paca (Linnaeus, 1766) has seldom been studied. In this paper, we report an unusual mixed infection of Echinococcus vogeli Rausch & Bernstein, 1972 and Calodium hepaticum (syn. Capillaria hepatica Bancroft, 1863) in free-ranging paca from a forested region in Acre (Brazil). Gross morphological examination revealed that paca liver contained multiple spherical to subspherical white or translucent lesions, which were isolated or frequently contiguous and partially covered by Glisson's capsule. Microscopic examination revealed unilocular cystic structures that contained abundant brood capsules in which numerous protoscolices budded from the inner surface. The protoscolices possessed rostellar hooks (33–41 μm in length), a morphological characteristic of the blade and calcareous corpuscles that is consistent with the metacestode E. vogeli. The diagnosis of C. hepaticum infection was based on the morphology and morphometry of the egg-shaped ellipsoids with bipolar plugs (44.8 ± 1.9 μm (length) × 24.4 ± 2.0 μm (width)) and liver histopathology. This finding expands the known range of C. hepaticum hosts in South America and, to the best of our knowledge, it is the first case of a mixed infection of E. vogeli and C. hepaticum. Furthermore, our data provide evidence that wild animal meat may be a source of C. hepaticum infection.

Type
Research Papers
Information
Journal of Helminthology , Volume 87 , Issue 4 , December 2013 , pp. 489 - 493
Copyright
Copyright © Cambridge University Press 2012 

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