Clinical Research Directory

Inclusion Criteria * Male and female international travelers from dengue-non-endemic countries * Age ≥18 years old * Able to read and understand English questionnaire * Willing to participate in the study Endemic countries of dengue will be defined as all countries in the ASEAN(Association of Southeast Asian Nations) economic community countries, Central and South American countries except Chile, and ten countries in Eastern Mediterranean and Africa showing high frequency of dengue transmission according to WHO(World Health Organization) and ECDC(European Centre for Disease Prevention and Control) data(Yemen, Egypt, Sudan, Eritrea, Djibouti, Tanzania, Kenya, Ethiopia, Somalia, Burkina Faso). Non-endemic countries refer to all the other countries apart from endemic countries. Exclusion Criteria * Travelers who are visiting the hospital for dengue vaccination or dengue infection or dengue-like symptoms, which is defined as acute fever with one of the following; rash, myalgia, headache, nausea, vomiting, retro-orbital pain. * Participants who are expatriate workers or lived in Thailand or other Southeast Asia countries for more than 1 year.