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This study was conducted to assess the effect of maternal serum IgG against<jats:named-content content-type=\"genus-species\">Cryptosporidium<\/jats:named-content>gp15 on responses to this antigen in children with (cases) and without (controls) PCR-confirmed cryptosporidial diarrhea. Maternal sera (<jats:italic>n<\/jats:italic>= 129) and sera from cases (<jats:italic>n<\/jats:italic>= 39) and controls (<jats:italic>n<\/jats:italic>= 90) collected at 3.5, 9, and 24 months of age were tested for serum IgG against<jats:named-content content-type=\"genus-species\">Cryptosporidium<\/jats:named-content>gp15 by enzyme-linked immunosorbent assay (ELISA). Seroconversion patterns were evaluated by estimating probabilities of seroconversion along three time points based on the transition pathways by using a first-order Markov chain process and empirical Bayesian estimates. There was no difference in serum IgG levels or seropositivity rates to gp15 between cases and controls across all time points in children or in IgG levels to this antigen between mothers of cases and controls. The most common transition pathway can be described as a seronegative child at 3.5 months who seroconverts at 9 months and remains seropositive at 24 months. This pattern remained stable irrespective of the serological status of the mother or the case or control status of the child. Children were most likely to be exposed to<jats:named-content content-type=\"genus-species\">Cryptosporidium<\/jats:named-content>for the first time between the ages of 3 and 9 months, and most of the children seroconverted by 24 months. The high degree of seroconversion among control children is suggestive of high rates of asymptomatic transmission in this region.<\/jats:p>","DOI":"10.1128\/cvi.00051-12","type":"journal-article","created":{"date-parts":[[2012,4,19]],"date-time":"2012-04-19T07:36:36Z","timestamp":1334820996000},"page":"849-854","update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":12,"title":["Serum IgG Responses and Seroconversion Patterns to Cryptosporidium gp15 among Children in a Birth Cohort in South India"],"prefix":"10.1128","volume":"19","author":[{"given":"Rajiv","family":"Sarkar","sequence":"first","affiliation":[{"name":"Department of Gastrointestinal Sciences, Christian Medical College, Vellore, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sitara Swarna Rao","family":"Ajjampur","sequence":"additional","affiliation":[{"name":"Department of Gastrointestinal Sciences, Christian Medical College, Vellore, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jayaprakash","family":"Muliyil","sequence":"additional","affiliation":[{"name":"Community Health Department, Christian Medical College, Vellore, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Honorine","family":"Ward","sequence":"additional","affiliation":[{"name":"Department of Gastrointestinal Sciences, Christian Medical College, Vellore, India"},{"name":"Division of Geographic Medicine and Infectious Diseases, Tufts Medical Center, Tufts University School of Medicine, Boston, Massachusetts, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elena N.","family":"Naumova","sequence":"additional","affiliation":[{"name":"Department of Gastrointestinal Sciences, Christian Medical College, Vellore, India"},{"name":"Department of Civil and Environmental Engineering, Tufts University School of Engineering, Medford, Massachusetts, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gagandeep","family":"Kang","sequence":"additional","affiliation":[{"name":"Department of Gastrointestinal Sciences, Christian Medical College, Vellore, India"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"235","reference":[{"key":"e_1_3_3_2_2","doi-asserted-by":"publisher","DOI":"10.1128\/JCM.01590-06"},{"key":"e_1_3_3_3_2","doi-asserted-by":"publisher","DOI":"10.1128\/JCM.02509-09"},{"key":"e_1_3_3_4_2","first-page":"178","article-title":"Cryptosporidium species in HIV-infected individuals in India: an overview","volume":"21","author":"Ajjampur SS","year":"2008","unstructured":"AjjampurSSSankaranPKangG. 2008. 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