Regional AlertVietnam dengue cases near 300K, Hanoi surpasses the epidemic warning threshold November 9, 2022By MBDS Team7 November 2022. Vietnam health authorities recorded more than 10,000 cases of dengue fever across the country in the past week, including two additional deaths. Compared to the same period in 2021 (56,240 cases/21 deaths), the number of dengue cases increased 4.8 times, the number of deaths increased by 91 cases.