Evaluation of Dengue Surveillance System of Chiang Dao Hospital, Chiang Mai Province

Abstract

In 2015 incidence rate of Dengue Hemorrhagic Fever (DHF) was higher than median during the last 5 years and also found more complicated patient and more hospitalization. To reduce the incidence of DHF, one important factor is an effective surveillance system, bring the study to determine the quantitative and qualitative attributes of the surveillance system and system improvement. Cross-sectional descriptive study was developed. Study group were among DHF patients in Chiang Dao hospital who had been diagnosed with dengue hemorrhagic fever and viral infections unspecified during January – December, 2015. The definition of dengue from epidemiological surveillance system evaluation was used for case definition. The study design is interview the personnel who involved in the system by using a questionnaire for collecting information and analzed by content analysis. Excel (Pivot Table) and Epiinfo Version 3.4.5 were used for quantitative data by descriptive statistics. Result: Sensitivity of surveillance system was 47.0 % and predictive value positive was 96.5 %. The variable related to higher rate of reporting was among patients who were initially and last diagnosed as dengue infection (Relative risk were 2.81, 4.59, respectively) and out-patient had significantly higher rate of 506 reports (RR=1.36; 95% CI 1.07-1.73). The lowest accuracy among variables was date of onset (6.1%). Surveillance systems are simple, flexible, high acceptability and stability. Recommendations: Should add measurement to increase the completeness of surveillance system. Not only diagnosed but also cases that met case definition should be reported. Increasing the accuracy of information especilly date of onset which is useful in controlled the disease and prevents outbreaks. Tourniquet test should be routinely applied for all high grade fever cases particular during epidemic period.