Evaluation of Dengue Surveillance System in Huaiyot Hospital, Huaiyot District, Trang Province, 2015

Abstract

Background: Dengue infection is a major public health problem in Trang province and Thailand. The incidence rate of dengue in Trang between 2013 and 2015 were 179.71, 73.72 and 82.39 per 100,000 population, respectively. Dengue incidence rate in Huiyot district were 263.0, 78.0 and 54.12 per 100,000 population, respectively without fatal case. Although the incidence of dengue infection was decreasing, but the incidence reported in 2015 was mismatched between in medical records (340 cases) and case reported in report 506 system (50 cases). Therefore, we conducted the surveillance evaluation with the aim to improve the dengue surveillance system both qualitative and quantitative attributes.
Methods: A cross-sectional study was conducted to review data of dengue cases at Huiyot hospital from 1 January to 31 December 2015. Case definition of suspected, probable and confirmed case were used to review information abstracted from random sampling medical record of 569 cases.
Results: Of the 569 medical records were reviewed, 139 cases were met the dengue definition and 50 cases were reported in the national surveillance system. The sensitivity was 35.97% while positive predictive value (PVP) was 100%. The representativeness was not well obtained due to data discrepancy of gender, age and disease onset. The reports were timely submitted to district health office (within 3 days) was 64%.
Conclusion: Dengue surveillance in Huiyot hospital needs improvement, especially sensitivity and timeliness. The recommendations for further improvement of the surveillance was strengthening the valid disease diagnosis to meet the requirement of the standard of surveillance system.