Epidemiological dynamics of dengue fever in mainland China, 2014-2018.

•Both imported and indigenous dengue fever show seasonal patterns from Aug. to Nov.•There were many dengue cases from people with occupations in commercial service. Most dengue cases occurred in individuals aged 20-50 years.•Imported dengue cases, mainly from Southeastern Asia, had doubled during these years.•Indigenous dengue cases were clustered in Yunnan border and southern Guangdong. They emerged gradually from southwestern and southern provinces to southeastern coastal provinces, and then to central and northern provinces every year. They spread from the southern regions to the central and northern regions in 2014-2018.