Materials and methods: A cross-sectional study, retrospective was conducted on 2, 769 cases of dengue fever / dengue hemorrhagic fever, 60 monthly reports of Breteau index (BI), mosquito density of Aedes aegypti (DI) of Bac Lieu Preventive Medicine Center and climate data (average relative humidity, rainfall and average temperature) of Bac Lieu Hydrometeorological Center from 2013 - 2017.