Objective To investigate the epidemic situation of dengue fever in Cambodia, the main source of imported cases to China, and the main influencing factors for imported dengue fever from Cambodia to China, and to help formulate targeted response measures and effectively prevent imported cases from abroad. Methods Dengue fever information in Cambodia from 2011 to 2019 was collected from the official website of the World Health Organization and the official account of Public Health Concerns at Frontier Ports. The information about dengue fever cases imported to China from Cambodia was extracted from the China Information System for Disease Control and Prevention. The number of tourists from China to Cambodia was inquired on the website www.chinaqw.com. Excel 2016 software was used to analyze the trend of dengue fever epidemic in Cambodia, the annual growth rate of the number of tourists from China to Cambodia, and the data on cases of dengue fever imported from Cambodia to China from 2011 to 2019. SPSS 19.0 software was used to perform partial correlation analysis. Results During 2011 to 2019, Cambodia had the highest incidence of dengue fever in 2019. In 2018, the proportion of cases of dengue fever from Cambodia increased sharply among total imported cases in China. In 2019, Cambodia became the main source of China's imported cases. At the same time, the number of Chinese residents visiting Cambodia increased year by year. The partial correlation coefficient between the proportion of dengue fever cases from Cambodia and Cambodia's incidence of dengue fever was 0.880 (P=0.004); the partial correlation coefficient between the proportion of dengue fever cases from Cambodia and the number of tourists to Cambodia was 0.887 (P=0.003). Conclusion The number of cases of dengue fever in Cambodia and the number of tourists from China to Cambodia are important factors affecting the number of imported cases in China. Chinese authorities should pay close attention to the incidence of dengue fever and the number of floating population in neighboring countries with close interactions.
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