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[Importance of the wild boar in the epidemiology of wild trichinellosis in Piedmont and Liguria].

Muscle samples from 1,508 wild boars (Sus scrofa) harvested in Piedmont and Liguria between 1987 and 1990 were examined for larvae of Trichinella sp. by trichinelloscopy and peptic digestion. No wild boar was infected, though trichinellosis was present in foxes (Vulpes vulpes) from the same areas (14 positives out of 608) with the highest prevalence in the mountain range (25.0%). Infection was also not found in 40 stone martens, 5 badgers and 3 stoats. Five vulpine isolates were identified as belonging to T3 zymodeme. These results show that free-ranging wild boars, although being a source of trichinellosis infection for man in Italy (9.2% of the 584 cases diagnosed since 1961), have no significance in maintaining the sylvatic cycle of this parasite in the study area. The data agree with the low infectivity of Italian strains of fox origin for swine seen in the experimental infections carried out so far.