HAND-FOOT-MOUTH DISEASE AND CLIMATIC FACTORS IN DAK LAK PROVINCE FROM 2012 TO 2013
Introduction: Hand-foot-mouth-disease (HFMD) is an emerging infectious disease caused by enterovirus. Based on the surveillance data of HFMD and climatic parameters, this study aims to describe the distribution of HFMD in Dak Lak in 2012-2013 and explore the influence of climatic factors on HFMD cases. Methodology: Case series and ecologic studies were used. HFMD case was defined based on MOH’s guidelines. Poisson regression was used to examine the association between the incidence of HFMD and climatic factors. Results: There were 6913 cases of HFMD in Dak Lak in 2012-2013. Mean age (SD) was 24 (17) months. The incidence of HFMD (per 100,000) was 224 in male, 165 in female, 227 in Kinh people, 119 in ethnic minority people. HFMD occurred in all districts and scattered throughout the year, but the highest incidence was in September, October and November (accounting for 43.3%). The climatic variables were related to HFMD cases. Each 1°C rising in temperature corresponded to an increased of 6.3% (RR=1.063, 95%CI=1.037-1.089) in the monthly number of HFMD cases. Similarly, an increase of each 1% in relative humidity, 50mm in rainfall or 5 hour of sunlight corresponded to an increase of 9,8% (RR=1.098, 95% CI=1.087-1.110); 1.7% (RR=1.017, 95% CI=1.005-1.029); 3.4% (RR=1.034, 95% CI=1.029-1.040) in the monthly number of HFMD cases respectively. Conclusions: HFMD occurred all the year round, peaked from September through November. The disease occurred mainly in children under 5 years of age (96%), more common in boys than in girls (ratio 1.4), in Kinh than ethnic minority people (ratio 1.9). There were HFMD cases in all districts of the province. Climatic factors (temperature, humidity, precipitation, sunshine hours) had a significant influence on occurrence and transmission of HFMD. Keywords: Hand-foot-mouth disease (HFMD), climatic factors