Epidemiological observation of dengue fever, dengue haemorrhagic fever in Nam Ha province, 1991-2000

ABSTRACT

DF/DHF is endemic disease in Nam Ha province with the following characteristics low incidence, sporadicalness, persistence and unprediction. All four type of dengue virus was isolated and was the causative agents of DF/DHF epidemic in the province. Two species of mosquito vector were collected, and Aedes aegypti is major vector in transmitting dengue virus. Breeding sites of Aedes aegypti were investigated with up to seven different kind of water bodies and key breeding places of the vector for both urban and rural areas are concrete tanks, jars, wells and discarded objects. It is first time well is recognized as breeding site of Aedes aegypti and added into checking list for Aedes larvae in Northern part of Viet Nam