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  • Author: H. Auer x
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Abstract

Taenia taeniaeformis and Taenia crassiceps are cestodes with voles as intermediate hosts and Felidae, Canidae and Mustelidae as definitive hosts. To evaluate the influence of T. taeniaeformis metacestodes on voles in Vorarlberg (Western Austria), a helminthological survey was performed on 318 common voles (Microtus arvalis) and 93 water voles (Arvicola terrestris). Furthermore the metacestodes themselves were analysed by morphometric methods. Our results demonstrate that both T. taeniaeformis and T. crassiceps are endemic in Vorarlberg, and that there is a significant difference between those infected with larvae of T. taeniaeformis and uninfected voles regarding body weight, but not sex or body length.

Abstract

Alveolar echinococcosis (AE), caused by proliferating metacestodes of the parasitic fox tapeworm Echinococcus multilocularis, is a life-threatening disease in humans. In this study we report four human cases of AE in Slovak Republic with regard to various clinical manifestations and susceptibility to chemotherapy with albendazole or mebendazole. Patients were monitored serologically by ELISA test and Western Blots within 2–5 years after initiation of chemotherapy/surgery. Using computerized tomography (CT) we compared morphological changes of the parasitic lesions in the liver during the course of treatment.

The parasitic lesions in the CT were manifested as nodular hyperplasia with hyper or hypodense zones and calcified foci within the lesion. In other cases the lesion was visualised as a hypodense poorly-delineated septated focus without calcifications. In the last case, the diagnosis of AE was confirmed only at surgery. Calcified foci found inside the main parasitic lesions were the only abnormality that was detected in two cases and were absent in other two cases. The levels of specific anti-parasitic antibodies followed the pathomorphological changes in the livers. Total IgG levels to Em2+ and EmP antigen declined gradually during the follow-up (1–5 years) and disappeared only in the patient receiving radical surgery (cured). In comparison with total IgG, concentration of the IgG4 antibody subclass seemed to correlate more adequately with the outcome of therapy as their levels decreased in improved/stabilised patients, but were elevated in “aggravated” patients. We showed that, in patients with AE in Slovakia, radical surgery of parasitic foci proved to be the most successful treatment and, in inoperable cases, albendazole and mebendazole were differently effective. Moreover. IgG4 levels rather than total IgG to protoscoleces antigens proved to be more sensitive serological marker of the progress of therapy.