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Journal of Tropical Medicine
Volume 2012, Article ID 936128, 8 pages
Research Article

A National Baseline Prevalence Survey of Schistosomiasis in the Philippines Using Stratified Two-Step Systematic Cluster Sampling Design

1College of Public Health, University of the Philippines Manila, 625 Pedro Gil Street, Manila 1000, Philippines
2Philippine Health Insurance Incorporated, Quezon City, Philippines
3National Center for Disease Prevention and Control, Philippine Department of Health, Santa Cruz, Manila, Philippines
4World Health Organization, San Lazaro Compound, Santa Cruz, Manila, Philippines

Received 28 July 2011; Revised 5 November 2011; Accepted 9 November 2011

Academic Editor: Hans Peter Beck

Copyright © 2012 Lydia Leonardo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


For the first time in the country, a national baseline prevalence survey using a well-defined sampling design such as a stratified two-step systematic cluster sampling was conducted in 2005 to 2008. The purpose of the survey was to stratify the provinces according to prevalence of schistosomiasis such as high, moderate, and low prevalence which in turn would be used as basis for the intervention program to be implemented. The national survey was divided into four phases. Results of the first two phases conducted in Mindanao and the Visayas were published in 2008. Data from the last two phases showed three provinces with prevalence rates higher than endemic provinces surveyed in the first two phases thus changing the overall ranking of endemic provinces at the national level. Age and sex distribution of schistosomiasis remained the same in Luzon and Maguindanao. Soil-transmitted and food-borne helminthes were also recorded in these surveys. This paper deals with the results of the last 2 phases done in Luzon and Maguindanao and integrates all four phases in the discussion.