Table 1. Prevalence of TF in children aged 1 to 9 years by surveillance zone in years 2011 to 2013.

	2011		2012		2013
Zone	n/N	% (95% CI)	n/N	% (95% CI)	n/N	% (95% CI)
A	5/402	1.2 (0.5–2.9)	15/441	3.4 (2.1–5.5)	10/833	1.2 (0.7–2.2)
B	8/460	1.7 (0.9–3.4)	11/605	1.8 (1.0–3.2)	18/953	1.9 (1.2–3.0)
C	0/444	0	5/427	1.2 (0.5–2.7)	13/712	1.8 (1.1–3.1)
D	7/498	1.4 (0.7–2.9)	19/496	3.8 (2.5–5.9)	37/1163	3.2 (2.3–4.4)
E	0/412	0	3/459	0.7 (0.2–1.9)	2/829	0.2 (0.1–0.9)
F	11/556	2 (1.1–3.5)	17/679	2.5 (1.6–4.0)	7/1111	0.6 (0.3–1.3)
G	3/548	0.5 (0.2–1.6)	0/360	0	21/1019	2.1 (1.4–3.1)
H	4/763	0.5 (0.2–1.3)	7/1043	0.7 (0.3–1.4)	5/1111	0.5 (0.2–1.0)
I	1/602	0.2 (0.03–0.9)	20/629	3.2 (2.1–4.9)	6/1650	0.4 (0.2–0.8)

CI = Confidence Interval