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Clinical manifestations of giardiasis, such as diarrhoea, anorexia, weight loss and lethargy, have been associated with<jats:italic>Giardia<\/jats:italic>infections in both domestic and farm animals. A few anti-parasitic drugs are routinely used to treat giardiasis, but re-infections are common and drug-resistant strains have already been reported. Unfortunately, efficient vaccines against<jats:italic>Giardia<\/jats:italic>are not available.<jats:italic>Giardia<\/jats:italic>undergoes antigenic variation; through this mechanism, parasites can avoid the host\u2019s immune defenses, causing chronic infections and\/or re-infections. Antigenic variation is characterised by a continuous switch in the expression of members of a homologous family of genes encoding surface antigens. In a previous report, we indicated that in<jats:italic>Giardia<\/jats:italic>, the mechanism responsible for the exchange of variant-specific surface proteins (VSPs) involves the RNA interference (RNAi) pathway. From a repertoire of ~200 VSP genes, only one is expressed on the surface of single trophozoites; however, RNAi machinery disruption generates trophozoites that express the complete VSP repertoire. We also demonstrated that gerbils orally immunised with VSPs isolated from these altered parasites showed high levels of protection. Here we tested this vaccine in cats and dogs, and found that it is highly efficient in preventing new infections and reducing chronic giardiasis in domestic animals both in experimental and natural infections. Remarkably, immunisation of dogs in a highly endemic area strongly decreased the percentage of infected children in the community, suggesting that this vaccine would block the zoonotic transmission of the disease.<\/jats:p>","DOI":"10.1038\/npjvaccines.2016.18","type":"journal-article","created":{"date-parts":[[2016,9,15]],"date-time":"2016-09-15T14:44:43Z","timestamp":1473950683000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":49,"title":["Vaccination of domestic animals with a novel oral vaccine prevents Giardia infections, alleviates signs of giardiasis and reduces transmission to humans"],"prefix":"10.1038","volume":"1","author":[{"given":"Marianela C","family":"Serradell","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alicia","family":"Saura","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lucia L","family":"Rupil","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pablo R","family":"Gargantini","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marcela I","family":"Faya","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paulina J","family":"Furlan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hugo D","family":"Lujan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2016,9,15]]},"reference":[{"key":"BFnpjvaccines201618_CR1","doi-asserted-by":"publisher","first-page":"71","DOI":"10.1016\/S0065-308X(08)60207-9","volume":"32","author":"RC Thompson","year":"1993","unstructured":"Thompson, R. 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