1,721,000 research outputs found
Models of parasite biocoenosis dynamic: host density and gastrointestinal parasites in alpine chamois
No full textHost density is an important and widely accepted factor influencing microparasites epidemiology.
In theory, host density would influence also macroparasite dynamic, although it would be achieved indirectly due to the presence of free-living infective stages of parasites. On this basis, it is expected that macroparasite abundance and prevalence would increase as host density increases, due to the higher probability for a new host to acquire infections from the environment. Nevertheless, some surveys indicate a negative relationship between host density and gastrointestinal helminth abundance in alpine chamois. On the basis of data collected from three different chamois populations, the Authors discuss the possibility that ecological factors different from host density should influence parasite biocoenosis dynamic, leading to the pattern observed in natural chamois-parasite systems
Feologia dell'emissione dei coccidi nel cinghiale (Sus scrofa) nel Parco Naturale della Maremma
No full textGli studi condotti sull'emissione di coccidi in cinghiali del Parco Naturale della Maremma hanno evidenziato un unico ampio picco nel periodo dicembre-maggio. L'assenza di picchi nel periodo dei parti e post-riproduttivo sembra indicare nelle condizioni macro/microclimatiche il principale fattore condizionante l'emissione di coccidi nel cinghiale nell'area di studi
Il depopolamento delle specie selvatiche ai fini sanitari: approccio teorico e possibilità pratiche
No full textIntestinal helminth parasite community in wolves (Canis lupus) in Italy
No full textFrom 1987 to 1993, 89 wolves (Canis lupus) collected throughout the whole Italian range were examined for intestinal helminth parasites. Twelve species were found, including 5 nematodes (Uncinaria stenocephala, Toxocara canis, Ancylostoma caninum, Trichuris vulpis and Toxascaris leonina) and 7 cestodes (Echinococcus granulosus, Taenia hydatigena, T. multiceps, T. pisiformis, T. ovis, Mesocestoides lineatus and Dipylidium caninum). No significant differences were detected between sexes. T. canis showed higher prevalence and numbers in youngs, while E. granulosus and T. vulpis in adults. Interference between U. stenocephala and A. caninum was detected. Parasite biocenosis was stable in respect to geographical and ecological variables
Effetti dell’abbattimento controllato sulla evoluzione della virulenza: il caso della peste suina classica
No full textSurveys on parasitic diseases: some considerations on sampling
No full textConsiderations about sampling in surveillance of animal parasitic diseases are presented. Proper sampling schemes in the framwork of epidemiologic surveillance should take into account aims of the surveillance activity, expected occurrence of the infection, the desired confidence limits, the accuracy of the diagnostic tests applied
Host-parasite relationship and competition among parasites: a model for gastrointestinal nematodes of chamois.
No full textA deterministic model considering the population dynamic of chamois and three parasite species (gastrointestinal nematodes) is presented. The
model considers the logistic growth of host population, exploitation and/or interference competition among different parasite populations and
intraspecific competition between parasite individuals. In vertebrates-parasites systems, intraspecific competition is well known and is probably
mediated by host immunity. The sensitivity of the parameter alpha (representing the parasite induced host mortality) and the comparison with field data suggest that intraspecific competition plays an important role in determining host and parasites abundances and in stabilizing
chamois-parasites relationship
Epidemiologia delle virosi respiratorie nel capriolo in provincia di Bologna
No full textA seroepidemiological survey has been carried out in roe deer and sympatric cattle in the Bologna Province. The following prevalences has been found: 52% to PI-3 Virus and 6% to BRSV in roe deer and of 67% and 54%, respectively, in cattle. Comparative analyses show that PI-3 Virushits indifferently both host species, with possible reciprocal transmission between them. Cattle seem to repreent the reservoir of BRSV, with sporadic infection in roe deer population. Antibodies to IBR Virus have not been found n roe dee
Indici di valutazione del test coprologico per alcune elmintiasi della volpe (Vulpes vulpes)
No full textFaecal samples and guts from 103 red foxed were examined for intestinal helminths. The discordance between the coprological results and those from necropsy gave a significant value only for tapeworms. Sensitivity values of the coprological test was 92% for Toxocara canis, 66.7% for Trichuris vulpis, 86.7 for hookworms and 10.8% for tapeworm
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