Journal
INTERNATIONAL JOURNAL FOR PARASITOLOGY
Volume 42, Issue 10, Pages 903-910Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijpara.2012.07.009
Keywords
Nematoda; Taxonomy; Ribosomal DNA; Puma concolor; Argentina; Trichinella patagoniensis; New species
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Funding
- Departamento de Parasitologia, Instituto Nacional de Enfermedades Infecciosas, Administracion Nacional de Laboratorios e Institutos de Salud, Dr. Carlos G. Malbran, Argentina
- European Commission [SANCO/2006/FOODSAFETY/032]
- Universidad de Buenos Aires, Secretaria de Ciencia y Tecnica, Argentina [V027]
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Until a few years ago, Trichinella spiralis was the only taxon of the genus Trichinella detected in both domestic and wild animals of South America. Recently, a new genotype, named Trichinella T12, was identified in cougars (Puma concolor) from Argentina, on the basis of molecular studies using mitochondrial and nuclear ribosomal markers. In the present study, cross-breeding experiments indicated that Trichinella T12 is reproductively isolated from all other encapsulated Trichinella spp. and suggested that it is biologically more similar to Trichinella britovi and Trichinella murrelli than to the other encapsulated species/genotypes. Biological assays revealed that the reproductive capacity index of Trichinella T12 was similar to 4 and >2000 times lower than those of T. spiralis in mice and rats, respectively. The reproductive capacity index of Trichinella T12 in domestic pigs ranged from 0.0 to 0.05. Larvae parasitising the muscles of carnivores were infective to mice after freezing at -5 degrees C for 3 months, but they lost infectivity after freezing at -18 degrees C for 1 week. The region within the rDNA, known as the expansion segment V. showed a unique sequence which differs from those of all other known Trichinella spp./genotypes. The biological, geographical and molecular data support the classification of the genotype Trichinella T12 as a new species widespread in the Neotropical region, for which we propose the name Trichinella patagoniensis n. sp. (C) 2012 Australian Society for Parasitology Inc. Published by Elsevier Ltd. All rights reserved.
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