| detection of neorickettsia risticii from various freshwater snail species collected from a district irrigation canal in nevada county, california. | this study investigated the role of a district irrigation canal in nevada county, california, usa, as the point source of infection for neorickettsia risticii, causative agent of equine neorickettsiosis (en). a total of 568 freshwater snails comprising juga spp., planorbella subcrenata (carpenter, 1857) (rough rams-horn), physella virgata (gould, 1855) (protean physa) and feces from three horses with en were collected and tested for n. risticii by real-time pcr. a total of four freshwater snails ... | 2013 | 23566936 |