Dengue haemorrhagic fever (DHF) caused by
the mosquito species Aedes aegypti is one of
the world’s major health problems.[1] In
Thailand, the reported cases of DHF vary from
20 000 cases to more than 100 000 cases
annually.[2] Recently, the incidence of DHF has
increased in many provinces in the northeastern
part of the country, including Ubon
Ratchathani, Si Sa Ket, Yasothon and Amnat
Charoen