Results: The study found that: the population rate at 197 - 223 cases/100, 000 is very high; DHF rates in adults have been increasing 30 - 40% compared with 15 - 20% previously; Males have a risk of getting DHF that is higher than females; severe DHF rate shock accounts for nearly 10% of cases; mortality rate was 0.1 - 0.2%; DHF in areas with crowded populations and new urbanization zones had higher rates than in rural areas with low population density.