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Background   Toxoplasma gondii  is found on all continents and can infect all endothermic vertebrates. Toxoplasmosis is a globally important zoonosis with potentially devastating health impacts both for humans and a range of domestic and wild species. The World Health Organisation have repeatedly recommended the collection of accurate epidemiological data for  T. gondii , yet despite recognised links between infection of wildlife, domestic animals and humans, seroprevalence in wild species is rarely monitored. Here, serological investigation using the Gold Standard Sabin-Feldman Dye Test was used to test for  T. gondii  in Eurasian otters ( Lutra lutra ) found dead, mainly as road-kill, in England and Wales. This is the first spatially widespread study of  T. gondii  in UK wildlife, and the first extensive survey of  T. gondii  in Eurasian otters, a sentinel species of fresh waters.    Findings  Infection was both common (39.5% prevalence, n = 271) and widespread, with significantly more infection in the east than the west of the UK. There was an increase in seroprevalence with age, but no sex bias.    Conclusions  The relatively high prevalence of  T. gondii  in a predominantly piscivorous freshwater mammal suggests widespread faecal contamination of freshwater ecosystems with oocysts. Continued surveillance of the Eurasian otter for  T. gondii  is valuable because of conservation concerns due to the otter’s ‘near threatened’ status on the IUCN Red List and because of the host’s role as a sentinel for freshwater health.

Seroprevalence of Toxoplasma gondii in the Eurasian otter (Lutra lutra) in England and Wales