The wild boar (Sus scrofa Linnaeus, 1758) as secondary reservoir of Fasciola hepatica in Galicia (NW Spain)

Autor: Santiago Mas-Coma, M. Adela Valero, Mercedes Mezo, José Antonio Castro-Hermida, Marta González-Warleta, M. Yolanda Manga-González, Raquel V. Peixoto
Přispěvatelé: Xunta de Galicia, Ministerio de Ciencia e Innovación (España), Ministerio de Economía y Competitividad (España), Generalitat Valenciana
Rok vydání: 2013
Předmět:
Zdroj: Digital.CSIC. Repositorio Institucional del CSIC
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Popis: Fasciolosis is an emerging or reemerging human and animal disease in numerous parts of the world. In Galicia (NW, Spain), the wild boar (Sus scrofa) is the main wild ungulate in terms of abundance and distribution. Its population has continuously increased over the past decades and this population growth has been accompanied by a reduction of habitats, so that the wild boar populations encroach more and more frequently onto agricultural lands. The increase of the interface area between livestock and the wild boars frequently involves the sharing of pastures and water sources, so that the circulation of common pathogens is propitiated. This is the first report concerning the importance of the wild boar as a possible reservoir of Fasciola hepatica infection in Spain. Livers from 358 hunted wild boars were analyzed showing that 11.2% were parasitized by F. hepatica, with burdens ranging from 1 to 14 flukes (mean = 2.3). Fecal analysis demonstrated that 40.0% of parasitized animals shed F. hepatica eggs with a mean excretion of 6.1 eggs per gram of feces (epg). The presence of coproantigens analyzed by MM3-COPRO ELISA was positive in 62.9% of infected wild boars. After incubation, the percentage of hatched eggs ranged between 41.0% and 90.0% suggesting that the wild boar is very likely to contribute to the environmental contamination with viable parasite eggs. Comparative morphometric data were obtained using a computer image analysis system (CIAS) on the basis of standardized measurements. F. hepatica from cattle, sheep and wild boars from the same geographical area presents a similar body development and gravidity. Our study shows for the first time that the F. hepatica uterus from the wild boar presents an intermediate size between that found in primary reservoir hosts such as cattle and sheep, i.e., the individual potential egg output capacity of the wild boar does not greatly differ from that detected in Galician livestock. These results show that F. hepatica in Galicia has a normal development in wild boars, presenting its own characteristics in shape and size in comparison with other host species. The high prevalence of infection detected in the wild boar, the normal fluke development in the liver, and the possibility of shedding F. hepatica eggs capable of embryonating and giving rise to viable miracidia with the potential to infect intermediate hosts suggest a possible role of this species as a secondary reservoir in this Spanish region.
The authors are grateful to the personnel of the Servizode Sanidade Animal-Consellería do Medio Rural e do Mar ofthe Government of Galicia for their helpful collaborationin collecting samples from the animals. Studies funded byProjects No. FAU2006-00021-C03-00 and AGL2011-30563-C03-02 of the Ministry of Economy and Competitiveness,Madrid, Spain; Project SAF2010-20805 of the Ministry ofScience and Innovation, Madrid, Spain; by the Red deInvestigación de Centros de Enfermedades Tropicales –RICET (Project No. ISCIII-RETIC RD06/0021/0017 of the Pro-grama de Redes Temáticas de Investigación CooperativaRETICS/FEDER), FIS, Ministry of Health, Madrid, and byProject No. 2012/042 of the PROMETEO Program, Gen-eralitat Valenciana, Valencia, Spain. This study is part ofthe worldwide initiative of WHO (Headquarters Geneva,Switzerland) against human fasciolosis.
Databáze: OpenAIRE
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