ABSTRACT
In Southern Viet Nam, since 1987 up to now, the viroligical surveillance offered knowledge of the epidemic serotype of dengue virus by years and its activity cycle as dengue-1 is 6 years since 1990; dengue-3 was introduced since 1995 and still acting for 2 or 3 years in the future. Genomic structure of the DEN-2/Vietnam/87 is somewhat different in comparison with many topotypes in the world, but closely related to the DEN-2 topotype of Jamaica. A close relationship has demonstrated between the DEN-3/VietNam/97-98 with the DEN-3/Thailand/1987. Confirmed DHF cases are demonstrated through virological and serological surveillance in the first quarter of the year. Therefore, the active surveillance and the DHF control programme must be implemented within this time
Subject(s)
Dengue , Disease OutbreaksABSTRACT
In 1998, Dengue viruses were prevalent in Southern Vietnam and 455.70 cases/100,000 population with 347 deaths were recorded. 219 dengue viruses were isolated from dengue haemorrhagic fever patients' serum, in which there were 26 dengue-1, 27 dengue-2, 162 dengue-3 and 4 dengue-4. 65.88% of isolates were recovered from children under 14 years old, 18.22% from older patients
Subject(s)
Dengue , Disease OutbreaksABSTRACT
Viruses in the Hantavirus genus, familay Bunyaviridae, include a number of important pathogens that cause haemorrhagic fever with renal syndrome (HFRS) in humans. In 1995, 78 human serum samples (with haemorrhagic fever syndrome) which were negative for dengue antibodies, 92 healthy human and 58 rodent sera (rattus norvegicus, rattus rattus) were collected for the detection of hantavirus antibodies. Their sera were assayed at first by the IgG- capture ELISA test. These preliminary results showed that there was circulation of Hantavirus and it is a causative agent of haemorrhagic fever in human in some areas in South Vietnam.