American Journal of Epidemiology Advance Access originally published online on May 12, 2009
American Journal of Epidemiology 2009 170(1):120-129; doi:10.1093/aje/kwp092
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PRACTICE OF EPIDEMIOLOGY |
The Nicaraguan Pediatric Dengue Cohort Study: Study Design, Methods, Use of Information Technology, and Extension to Other Infectious Diseases
Correspondence to Dr. Eva Harris, Division of Infectious Diseases and Vaccinology, School of Public Health, University of California, Berkeley, 1 Barker Hall, Berkeley, CA 94720-7354 (e-mail: eharris{at}berkeley.edu).
Received for publication January 16, 2009. Accepted for publication March 23, 2009.
Dengue is a mosquito-borne viral disease that is a major public health problem worldwide. In 2004, the Pediatric Dengue Cohort Study was established in Managua, Nicaragua, to study the natural history and transmission of dengue in children. Here, the authors describe the study design, methods, and results from 2004 to 2008. Initially, 3,721 children 2–9 years of age were recruited through door-to-door visits. Each year, new children aged 2 years are enrolled in the study to maintain the age structure. Children are provided with medical care through the study, and data from each medical visit are recorded on systematic study forms. All participants presenting with suspected dengue or undifferentiated fever are tested for dengue by virologic, serologic, and molecular biologic assays. Yearly blood samples are collected to detect inapparent dengue virus infections. Numerous information and communications technologies are used to manage study data, track samples, and maintain quality control, including personal data assistants, barcodes, global information systems, and fingerprint scans. Close collaboration with the Nicaraguan Ministry of Health and use of almost entirely local staff are essential components for success. This study is providing critical data on the epidemiology and transmission of dengue in the Americas needed for future vaccine trials.
Central America; cohort studies; dengue; information systems; methods; Nicaragua
Abbreviations: CBC, complete blood count; DENV, dengue virus; GPS, global positioning system; HCSFV, Health Center Sócrates Flores Vivas; HIMJR, Hospital Infantil Manuel de Jesús Rivera; PDA, personal data assistant; RT-PCR, reverse transcriptase-polymerase chain reaction