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However, little is known about these interactions and the mechanisms involved. In this study, a coproparasitological survey was carried out in school\u2010age children living in endemic areas of parasitic infection in the state of Sergipe, Northeastern Brazil. Anti\u2010helminth\u2010specific and total secretory immunoglobulin\u2010A (SIgA) levels were measured in stool and saliva samples and were compared in children presenting monoparasitism, polyparasitism (helminths and\/or intestinal protozoa) and no infections. The survey showed that protozoa were more prevalent than helminths, and that there was a high frequency of polyparasitism in the studied population, mainly from combinations of protozoan species. Although less frequent, combinations between species of protozoa and helminths were also observed. The levels of salivary SIgA in these co\u2010infected individuals were lower than the average observed in infections with helminths alone. Although the children participating in this survey were asymptomatic, and it was, therefore, not possible to evaluate the impact of salivary SIgA reduction on the diseases, and the study highlights the need for further investigations of co\u2010infections by intestinal parasites and the effects on immune response induced by the interactions between different parasites.<\/jats:p>","DOI":"10.1111\/pim.12899","type":"journal-article","created":{"date-parts":[[2021,12,3]],"date-time":"2021-12-03T12:21:23Z","timestamp":1638534083000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Intestinal polyparasitism and levels of mucosal anthelmintic SIgA in children from endemic areas in Northeastern Brazil"],"prefix":"10.1111","volume":"44","author":[{"given":"Luciana M.","family":"Oliveira","sequence":"first","affiliation":[{"name":"Postgraduate Program in Parasite Biology Universidade Federal de Sergipe  S\u00e3o Crist\u00f3v\u00e3o Brazil"},{"name":"Department of Morphology Universidade Federal de Sergipe  S\u00e3o Cristov\u00e3o Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yvanna L. 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