**6. Conclusions**

Our study focused on residents in communities with mild or asymptomatic dengue virus infection rather than on patients with severe clinical symptoms to explore the risk factors for dengue virus infection in Guangdong Province because the former sample is highly representative. We established the relationship between dengue infection and individual risk factors. This information is beneficial for avoiding infection by the dengue virus. We also provided evidence and a basis for the development of measures for DF prevention and control. Additional variables must be introduced into the logistic regression model, and further research should be conducted to provide a theoretical basis for formulating prevention and control measures for DF.

**Supplementary Materials:** The following are available online at http://www.mdpi.com/1660-4601/16/4/617/s1, File 1: The contents of the questionnaire.

**Author Contributions:** L.J. drafted the manuscript and conducted the data-cleansing process and further data analysis. T.X. collected the questionnaires and performed the questionnaire data entry. D.Y. performed laboratory experiments and the follow-up questionnaire survey. D.Z. conducted initial data analysis. L.T. performed laboratory experiments. H.Y. provided the database of serum and financial resources. Z.D. designed the research, supervised all the work and checked the manuscript. All authors re-examined and approved the final manuscript.

**Funding:** This work was supported by the National Science and Technique Major Project of China (grant number 2018ZX10715004).

**Acknowledgments:** We are grateful for the assistance offered by the National Science and Technique Major Project in sample collection. We also appreciate the research assistance that was offered by the Health and Family Planning Commission in Yuexiu District and Liwan District, Yuexiu District Centre for Disease Control and Zhongshan Centre for Disease Control. We thank the investigators, such as staff and students in the School of Public Health for providing field and laboratory assistance, and all subjects.

**Conflicts of Interest:** The authors declare no conflicts of interest.
