Several methods have been used for the diagnoses of DF.
However, there lacks an accurate means to predict the severity
of disease at early stages of the infection. Since patients with
mild or classical DF can develop SDD later [2], it is important
to look for symptoms/signs to facilitate the early prediction
of the progression into SDD. The establishment of predictive
symptoms/signs is essential for preventing unnecessary
hospitalization, reducing disease burden, and controlling
potential SDD. Based on the dengue guidelines (2009), the
warning symptoms/signs for SDD include abdominal pain or
tenderness, persistent vomiting,mucosal bleed, lethargy, and
restlessness