Table 1: EQAS serogrouping result of enteric pathogens, 2008-2013 (all the data were copied from WHO-Afro EQAS annual reports from 2008-2013).

Year of Participation	TN of Isolates Serogrouped	% of Correctly Serogrouped Isolates (P)	% of Outlier (probability of an Error (1-P)	Standard Error	95% CI
2008	8	7 (87.5%)	E1 (12.5%)	0.117	0.65-1.104
2009	12	11 (91.7%)	D2 for D1 (8.3%)	0.079	0.76-1.07
	C. jejuni (2)	C.jejuni (1) (50%)	C.coli for C.j (0.5)
	V.mimicus (1)	Vibrio (1)	-
2010	12	11 (91.7%)	(8.3%) G (O:13)Not reported	0.079	0.76-1.07
	C.jejuni (1)	C.jejuni (1) 100%	-
	C. coli(1)	C. coli (1)100%
	S.enterica (D1&D2) (1)		S.enterica for Citrobacter spp
2011	8	8 (100%)	-	-
2012	12	11 (91.7%)	E4 for E1 (8.3%)	0.079	0.76-1.07
	S.paratyphi (1)	-	S p for S.arizona
2013	12	11 (91.7%)	A for C2-C3 (0.083)	0.079	0.76-1.07
Total	71	62 (87%)