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Article: A cross-sectional study of the prevalence of intensity of infection with Schistosoma japonicum in 50 irrigated and rain-fed villages in Samar Province, the Philippines

TitleA cross-sectional study of the prevalence of intensity of infection with Schistosoma japonicum in 50 irrigated and rain-fed villages in Samar Province, the Philippines
Authors
Issue Date2006
PublisherBioMed Central Ltd. The Journal's web site is located at http://www.biomedcentral.com/bmcpublichealth/
Citation
BMC Public Health, 2006, v. 6, article no. 61 How to Cite?
AbstractBackground: Few studies have described heterogeneity in Schistosoma japonicum infection intensity, and none were done in Philippines. The purpose of this report is to describe the village-to-village variation in the prevalence of two levels of infection intensity across 50 villages of Samar Province, the Philippines. Methods: This cross-sectional study was conducted in 25 rain-fed and 25 irrigated villages endemic for S. japonicum between August 2003 and November 2004. Villages were selected based on irrigation and farming criteria. A maximum of 35 eligible households were selected per village. Each participant was asked to provide stool samples on three consecutive days. All those who provided at least one stool sample were included in the analysis. A Bayesian three category outcome hierarchical cumulative logit regression model with adjustment for age, sex, occupation and measurement error of the Kato-Katz technique was used for analysis. Results: A total of 1427 households and 6917 individuals agreed to participate in the study. A total of 5624 (81.3%) participants provided at least one stool sample. The prevalences of those lightly and at least moderately infected varied from 0% (95% Bayesian credible interval (BCI): 0%-3.1%) to 45.2% (95% BCI: 36.5%-53.9%) and 0% to 23.0% (95% BCI: 16.4%-31.2%) from village-to-village, respectively. Using the 0-7 year old group as a reference category, the highest odds ratio (OR) among males and females were that of being aged 17-40-year old (OR = 8.76; 95% BCI: 6.03-12.47) and 11-16-year old (OR = 8.59; 95% BCI: 4.74-14.28), respectively. People who did not work on a rice farm had a lower prevalence of infection than those working full time on a rice farm. The OR for irrigated villages compared to rain-fed villages was 1.41 (95% BCI: 0.50-3.21). Discussion: We found very important village-to-village variation in prevalence of infection intensity. This variation is probably due to village-level variables other than that explained by a crude classification of villages into the irrigated and non-irrigated categories. We are planning to capture this spatial heterogeneity by updating our initial transmission dynamics model with the data reported here combined with 1-year post-treatment follow-up of study participants. © 2006Tarafder et al; licensee BioMed Central Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/86880
ISSN
2015 Impact Factor: 2.209
2015 SCImago Journal Rankings: 1.372
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorTarafder, MRen_HK
dc.contributor.authorBalolong Jr, Een_HK
dc.contributor.authorCarabin, Hen_HK
dc.contributor.authorBélisle, Pen_HK
dc.contributor.authorTallo, Ven_HK
dc.contributor.authorJoseph, Len_HK
dc.contributor.authorAlday, Pen_HK
dc.contributor.authorGonzales, ROen_HK
dc.contributor.authorRiley, Sen_HK
dc.contributor.authorOlveda, Ren_HK
dc.contributor.authorMcGarvey, STen_HK
dc.date.accessioned2010-09-06T09:22:27Z-
dc.date.available2010-09-06T09:22:27Z-
dc.date.issued2006en_HK
dc.identifier.citationBMC Public Health, 2006, v. 6, article no. 61en_HK
dc.identifier.issn1471-2458en_HK
dc.identifier.urihttp://hdl.handle.net/10722/86880-
dc.description.abstractBackground: Few studies have described heterogeneity in Schistosoma japonicum infection intensity, and none were done in Philippines. The purpose of this report is to describe the village-to-village variation in the prevalence of two levels of infection intensity across 50 villages of Samar Province, the Philippines. Methods: This cross-sectional study was conducted in 25 rain-fed and 25 irrigated villages endemic for S. japonicum between August 2003 and November 2004. Villages were selected based on irrigation and farming criteria. A maximum of 35 eligible households were selected per village. Each participant was asked to provide stool samples on three consecutive days. All those who provided at least one stool sample were included in the analysis. A Bayesian three category outcome hierarchical cumulative logit regression model with adjustment for age, sex, occupation and measurement error of the Kato-Katz technique was used for analysis. Results: A total of 1427 households and 6917 individuals agreed to participate in the study. A total of 5624 (81.3%) participants provided at least one stool sample. The prevalences of those lightly and at least moderately infected varied from 0% (95% Bayesian credible interval (BCI): 0%-3.1%) to 45.2% (95% BCI: 36.5%-53.9%) and 0% to 23.0% (95% BCI: 16.4%-31.2%) from village-to-village, respectively. Using the 0-7 year old group as a reference category, the highest odds ratio (OR) among males and females were that of being aged 17-40-year old (OR = 8.76; 95% BCI: 6.03-12.47) and 11-16-year old (OR = 8.59; 95% BCI: 4.74-14.28), respectively. People who did not work on a rice farm had a lower prevalence of infection than those working full time on a rice farm. The OR for irrigated villages compared to rain-fed villages was 1.41 (95% BCI: 0.50-3.21). Discussion: We found very important village-to-village variation in prevalence of infection intensity. This variation is probably due to village-level variables other than that explained by a crude classification of villages into the irrigated and non-irrigated categories. We are planning to capture this spatial heterogeneity by updating our initial transmission dynamics model with the data reported here combined with 1-year post-treatment follow-up of study participants. © 2006Tarafder et al; licensee BioMed Central Ltd.en_HK
dc.languageengen_HK
dc.publisherBioMed Central Ltd. The Journal's web site is located at http://www.biomedcentral.com/bmcpublichealth/en_HK
dc.relation.ispartofBMC Public Healthen_HK
dc.rightsBMC Public Health. Copyright © BioMed Central Ltd.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleA cross-sectional study of the prevalence of intensity of infection with Schistosoma japonicum in 50 irrigated and rain-fed villages in Samar Province, the Philippinesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1471-2458&volume=9&spage=61&epage=&date=2006&atitle=A+cross-sectional+study+of+the+prevalence+of+intensity+of+infection+with+Schistosoma+japonicum+in+50+irrigated+and+rain-fed+villages+in+Samar+Province,+the+Philippinesen_HK
dc.identifier.emailRiley, S:sriley@hkucc.hku.hk, steven.riley@hku.hken_HK
dc.identifier.authorityRiley, S=rp00511en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1186/1471-2458-6-61en_HK
dc.identifier.scopuseid_2-s2.0-33645533057en_HK
dc.identifier.hkuros123132en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33645533057&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume6en_HK
dc.identifier.spagearticle no. 61-
dc.identifier.epagearticle no. 61-
dc.identifier.isiWOS:000236587200001-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridTarafder, MR=12800484800en_HK
dc.identifier.scopusauthoridBalolong Jr, E=9636314600en_HK
dc.identifier.scopusauthoridCarabin, H=7003743787en_HK
dc.identifier.scopusauthoridBélisle, P=6601973587en_HK
dc.identifier.scopusauthoridTallo, V=12800194400en_HK
dc.identifier.scopusauthoridJoseph, L=7103166124en_HK
dc.identifier.scopusauthoridAlday, P=12800353800en_HK
dc.identifier.scopusauthoridGonzales, RO=14007268300en_HK
dc.identifier.scopusauthoridRiley, S=7102619416en_HK
dc.identifier.scopusauthoridOlveda, R=6701313494en_HK
dc.identifier.scopusauthoridMcGarvey, ST=7006300581en_HK

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