ArticlePLoS neglected tropical diseases2026
Estimating enteric fever seroincidence in rural western Cambodia: Findings from a population-based cross-sectional serosurvey.
Article in PLoS neglected tropical diseases, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
introductionEnteric fever, caused by Salmonella enterica serovars Typhi and Paratyphi, remains an important cause of febrile illness in low- and middle-income countries (LMIC). However, the exact burden is difficult to estimate due to limitations in diagnosis and surveillance.
methodsSamples from a representative cross-sectional household serosurvey in rural western Cambodia were used to estimate enteric fever seroincidence among children and young adults. Participants were enrolled between April 7 and December 10, 2023, and 529 samples from individuals aged 5-25 years were analysed. Using IgA and IgG responses to hemolysin E antigen and established models of antibody decay after infection, we estimated seroincidence, conveying the rate of new infection in the population over time.
resultsThe overall enteric fever seroincidence rate was 161.8/1,000 person-years (95%CI: 147.5, 177.5). Among children 5-15 years, it ranged between 149.5 (95%CI: 120.8, 185.1) and 239.0 (95%CI:188.7, 302.7) across districts. Seroincidence was higher among children 5-15 years from households with unimproved drinking water sources or sanitation facilities, and in districts with a higher proportion of households with unimproved WASH.
conclusionThese findings potentially support the introduction of the typhoid conjugate vaccine in rural western Cambodia. However, additional data on the relative contribution of S. Typhi versus S. Paratyphi is needed. We also demonstrate seroincidence as an adjunctive valuable surveillance tool in LMICs where facility-based surveillance may be inadequate.
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