Vietnam is a tropical country, dengue fever is a common disease in our country. Every year hundreds of thousands of dengue cases are recorded, as in 2019, more than 300,000 dengue cases were reported. Dengue is common in most provinces of the country, concentrated in the Central Highlands, the South and the North. The disease often increases in the rainy season, the months of August, September, October and November every year often have a high number of dengue cases.