Table 2. Clinical features of seropositive and seronegative cases.

Symptoms	ELISA positive cases (n = 51)	ELISA negative cases (n = 213)	Odds ratio (95% CI)	p-value
Headache	40(78.43%)	133(62.4%)	2.19 (1.1–4.5)	0.018
Anorexia	31(60.78%)	75(35.21%)	7.7 (3.7–16.3)	0.01
Nausea	30(58.82%)	71(33.33%)	2.92(2–5.5)	0.01
Myalgia	38(74.5%)	148(69.48%)	1.3 (0.6–2.6)	0.49
Retro-orbital pain	9(17.6%)	15(7.04%)	2.83 (1.2–6.9)	0.018
Skin rash	5(9.8%)	7(3.29%)	3.2(1–10.5)	0.045
Abdominal pain	8(15.69%)	43(20.19%)	0.74(0.3–1.7)	0.47