Canine Dracunculus Nematode Infection, Toledo, Spain

Area of Science:

• Veterinary Parasitology
• Molecular Biology
• Infectious Diseases

Background:

• Dracunculus worms are parasitic nematodes known to infect mammals.
• Previous infections have been documented primarily in North America and Africa.
• The presence of Dracunculus in Europe had not been confirmed in mammalian hosts.

Purpose of the Study:

• To identify and characterize a Dracunculus worm found in a dog in Spain.
• To determine the origin and genetic relationship of the identified parasite.
• To assess the implications for mammalian Dracunculus infections in Europe.

Main Methods:

• A worm fragment was extracted from a naturally infected dog.
• DNA was extracted from the worm fragment.
• Cytochrome oxidase I (COI) and ribosomal RNA (rRNA) gene sequencing was performed.
• Sequence data was analyzed and compared to known Dracunculus species.

Main Results:

• Genetic sequencing confirmed the fragment belonged to a Dracunculus species.
• The analysis identified the infection as autochthonous, meaning it originated locally in Europe.
• Phylogenetic analysis indicated a close genetic relationship to a Dracunculus parasite previously found in a North American opossum.

Conclusions:

• This study confirms the first autochthonous mammalian Dracunculus infection in Europe.
• The findings suggest potential transmission pathways or a wider distribution of Dracunculus species than previously understood.
• Further surveillance and research are warranted to understand the epidemiology of Dracunculus in European wildlife and domestic animals.