ArticlePLoS neglected tropical diseases2023
Haplotypic analysis of cox1 from Toxocara canis demonstrates five distinct clades that are not geographically defined.
Article in PLoS neglected tropical diseases, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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2 citing papers in PubMed.
- Environmental contamination with canine soil-transmitted helminths in New Zealand urban areas: A nationwide molecular, spatial, and risk factor analysis survey.One health (Amsterdam, Netherlands) · 2026Article
- Morphological and molecular description of Corynosoma paraevae n. sp. (Acanthocephala: Polymorphidae) juveniles from Notothenia coriiceps Richardson (Perciformes: Nototheniidae) in Argentine Islands, West Antarctica.Systematic parasitology · 2025Article
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7 authors.
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Abstract
backgroundToxocara canis is a cosmopolitan parasite of dogs that is transmitted transplacentally to puppies resulting in widespread shedding of eggs in the environment. However, it is not clear if there are dominant parasite genotypes that are more common, pathogenic, or likely to be zoonotic. METHODS/PRINCIPLE
findingsSequences of mitochondrial cox1 gene from adult worms were used to compare parasites from the United States with submitted sequences from parasites isolated from dogs in different countries. Our analysis revealed at least 55 haplotypes. While we expected the North American worms to form a distinct cluster, we found haplotypes of T. canis reported elsewhere existing in this population. Interestingly, combining the sequence data from our study with the available GenBank data, analysis of cox1 sequences results in five distinct clades that are not geographically defined.
conclusionsThe five clades of T. canis revealed in this study potentially have unique life histories, traits, or host preferences. Additional investigation is needed to see if these distinct clades represent cryptic species with clinically useful attributes or genotypes with taxonomic value. Evaluation of common mitochondrial genes may reveal distinct populations of zoonotic T. canis.
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