DENGUE FEVER WITH NORMAL PLATELET COUNT IN A PATIENT WITH Β-THALASSEMIA TRAIT: A CASE REPORT

Dengue fever is an arboviral infection typically characterized by thrombocytopenia and hemoconcentration. However, hematological manifestations may differ in patients with underlying hemoglobinopathies. We report a case of 18-year-old female diagnosed with dengue fever (IgM ELISA positive), presented with persistent fever, vomiting, and myalgia. Laboratory evaluation revealed moderate microcytic anemia (Hb 9.7 g/dL, MCV 54.7 fL) with a low Mentzer index (8.7). High-performance liquid chromatography confirmed β-thalassemia trait (HbA2 4.6%). Contrary to the typical presentation of dengue, the patient had elevated platelet counts at admission (584,000/µL), which remained within normal to high range during hospitalization. This case highlights that dengue infection may occur without thrombocytopenia, particularly in patients with underlying hemoglobinopathies. Clinicians should not exclude dengue solely on the basis of a normal platelet count.