| Summary: | The cestode Echinococcus multilocularis is a trophically-transmitted parasite that is normally maintained in a sylvatic life-cycle involving wild canid definitive hosts and small mammal intermediate hosts. As etiological agent of Alveolar Echinococcosis in humans, this cestode is currently considered the third most impacting food-borne parasite globally. Understanding E. multilocularis transmission strategies, combined with data of parasite infection in wild intermediate hosts, is crucial for disease prevention and risk management. Manipulation of host behaviour by parasites to enhance transmission to the next host is a fascinating phenomenon that interested scientist since the ’70s. It has been proposed that infection with the cestode Echinococcus multilocularis in common voles (Microtus arvalis) produces an impairment of the anti-predator behaviour in the rodent intermediate host, which facilitates transmission of the tapeworm to the canid final host. In this study we observed the behaviour of infected common voles at 8 and 12 weeks post-infection, when protoscoleces production and maturation normally occurs, in order to assess the occurrence of behavioural changes compared to uninfected controls, that might ease predation in the wild. Infected and uninfected voles were monitored 24-hour at each experimental stage in order to observe their spontaneous activity. In addition, on the next day both infected and uninfected voles were subjected to four different behavioural tests: open field test, barrier test, platform test and air-puff test in a running wheel. No significant difference between uninfected and infected voles emerged during the behavioural tests. However, the observation of the spontaneous activity revealed that infected voles increased their feeding frequency and spent significantly longer time above bedding even when not eating, compared to the uninfected controls. The latter behavioural changes in the wild increase the exposure to environmental factors and might increase the probability to be ...
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