Risk Factors for Hospitalization and Transfusion Criteria in Patients With Dengue Virus Infection

This study will prospectively follow patients over 3 years to determine the relationship between clinical/laboratory variables and outcomes such as hospitalization and transfusion need. It seeks to improve understanding of real-world decision-making in transfusions for dengue-related thrombocytopenia and refine current hospitalization criteria based on locally observed predictors. Patients will be enrolled consecutively at emergency departments or outpatient clinics with confirmed dengue infection. Clinical data (fever duration, bleeding signs, vomiting, abdominal pain, platelet count, hematocrit) and transfusion records will be collected and analyzed to identify independent predictors using multivariate logistic regression.