Dengue Virus Infection Amongst Patients With Acute Febrile Illness

Inclusion Criteria: * Patients age ≥ 4 years old with fever (≥ 37.5°C), history of fever with antipyretic use, lasting less than or equal to 7 days * Presence at least one of the following dengue-like symptoms: * Headache * Retro-orbital pain * Nausea/ vomiting * Muscle, bone, or joint pain * Rash or bleeding manifestations * Patient or patient's guardian giving consent to participate in the study Exclusion Criteria: * Have a condition that may interfere with study procedures and compliance (based on doctor's assessment) * Suspected of focal infection