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Given the immunoregulatory dysregulation experienced in infected individuals, this study examined the impact of chronic schistosomiasis on the sustainability of vaccine-induced immunity in both children living in endemic areas and experimental infections in mice. Data show that chronic<jats:italic>Schistosoma mansoni<\/jats:italic>infection impaired the persistence of vaccine specific antibody responses in poliovirus-vaccinated humans and mice. Mechanistically, schistosomiasis primarily fostered plasmablast and plasma cell death in the bone marrow and removal of parasites following praziquantel treatment reversed the observed cell death and partially restored vaccine-induced memory responses associated with increased serum anti-polio antibody responses. Our findings strongly suggest a previously unrecognized mechanism to explain how chronic schistosomiasis interferes with an otherwise effective vaccine regimen and further advocates for therapeutic intervention strategies that reduce schistosomiasis burden in endemic areas prior to vaccination.<\/jats:p>","DOI":"10.1371\/journal.ppat.1010327","type":"journal-article","created":{"date-parts":[[2022,2,14]],"date-time":"2022-02-14T19:00:13Z","timestamp":1644865213000},"page":"e1010327","update-policy":"https:\/\/doi.org\/10.1371\/journal.ppat.corrections_policy","source":"Crossref","is-referenced-by-count":19,"title":["Schistosoma mansoni infection induces plasmablast and plasma cell death in the bone marrow and accelerates the decline of host vaccine responses"],"prefix":"10.1371","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0216-0385","authenticated-orcid":true,"given":"Fungai","family":"Musaigwa","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0183-8078","authenticated-orcid":true,"given":"Severin Donald","family":"Kamdem","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5462-6648","authenticated-orcid":true,"given":"Thabo","family":"Mpotje","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Paballo","family":"Mosala","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nada","family":"Abdel Aziz","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2449-5365","authenticated-orcid":true,"given":"De\u2019Broski R.","family":"Herbert","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Frank","family":"Brombacher","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6153-9729","authenticated-orcid":true,"given":"Justin Komguep","family":"Nono","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"340","published-online":{"date-parts":[[2022,2,14]]},"reference":[{"key":"ppat.1010327.ref001","doi-asserted-by":"crossref","first-page":"1526","DOI":"10.3389\/fmicb.2020.01526","article-title":"Impact of Vaccines; Health, Economic and Social Perspectives","volume":"11","author":"CMC Rodrigues","year":"2020","journal-title":"Front Microbiol"},{"issue":"7784","key":"ppat.1010327.ref002","doi-asserted-by":"crossref","first-page":"S58","DOI":"10.1038\/d41586-019-03642-w","article-title":"The case for mandatory vaccination","volume":"575","author":"L. 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