Table 1.

Seroprevalences by age

	Age group (years)	Positive/Total (%)	OR	95% CI	P-value
Operational areas	< 30	33/252 (13.1)	Reference
	30–39	8/95 (8.4)	0.6	0.2–1.4	0.2
	40–49	16/99 (16.2)	1.3	0.6–2.5	0.5
	> 50	4/40 (10.0)	0.7	0.2–2.0	0.6
Without prior mission	< 30	10/232 (4.3)	Reference
	30–39	2/26 (7.7)	1.8	0.2–9.1	0.4
	40–49	0/7 (0)	–	–	–
	> 50	0/2 (0)	–	–	–