| Summary: | The parasite <i>Cryptosporidium</i> <i>parvum</i> represents a threat to livestock health and production, water quality and public health. Cattle are known to be significant reservoirs of <i>C. parvum</i>, but transmission routes are complex and recent studies have implicated the potential role of wildlife in parasite transmission to cattle and water sources. On the Orkney Isles, high densities of Greylag geese (<i>Anser</i><i> </i><i>anser</i>) cause widespread faecal contamination of cattle pastures, where cryptosporidiosis is known to be the main cause of neonatal calf diarrhoea and <i>Cryptosporidium </i>contamination frequently occurs in two reservoirs supplying Mainland Orkney’s public water. This study aimed to determine the <i>Cryptosporidium</i> species and subtypes present in geese and calves co-grazing on four farms surrounding two reservoirs on Mainland Orkney. Results indicated a high level of <i>C. parvum</i> prevalence in calves, geese and water samples. gp60 analysis illustrated that higher genotypic diversity was present in the goose population compared with calves, but did not yield sequence results for any of the water samples. It can be concluded that the high levels of <i>C. parvum</i> evident in calves, geese and water samples tested represents a significant risk to water quality and public health.
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