Epidemiological Situation of Dengue in Thailand

Abstract: Dengue haemorrhagic fever is one of the major infectious diseases in Thailand with trend to increase morbidity in its subperiodic fluctuations. All provinces were infected and more prone in Bangkok and other dense populated provinces in the North East. Recently Nakhon Sri Thammarat province in the South was the second rank in morbidity due to the internal migration of labour from the North East to the South working in coffee and oil palm plantation thus causing the South to be the highest epidemic of Dengue in Thailand. Monthly incidences correlated with rain in whole Thailand, but no correlation with rain was found in Bangkok area. The non rain correlation were found in Bangkok and other large metropolis due to continuous supply of pipe water and habit of people storing water for domestic use. All 4 serotypes were found and 10 % was one serotype causing primary dengue infection. Eighty to 90 % were secondary dengue infection. The most commonserotype was dengue 2. Both sexes were equally infected and more in young children than adult, 5-9 year were the most infected age group but there was trend to increase in older age group. Apart from classical dengue, DHF and DSS an extended dengue syndrome was discovered. It was characterized by encephalopathy and hepatic involvement and associated with dengue type 1