Table 1 Clinical features of hospitalized patients (N = 40)

Symptoms

 Fever

40

100

 Headache

39

97.5

 Retro-orbital pain (eye pain)

29

72.5

 Digestive problems (nausea/vomiting)

17

42.5

 Muscle pain (myalgia)

35

87.5

 Join pain (arthralgia)

28

70

 Chills

7

17.5

 Skin rash

6

15

 Petechiae

2

5

 Bleeding nose or gum

2

5

 Bleeding within 8 days

1

2.5

Clinical tests

 Tourniquet test

40

100

 Leukopenia (<5000/mm3)

30

78.9

 Thrombocytopenia (<100,000/mm3)

13

34.2

 Elevated hematocrit (>20 % increased)

9

23.1