Table 1.

Samples processed and positive for influenza by season

Season	Sourcea	Samples processed	Influenza-positive		Influenza A cases		Influenza B cases
			n	%	n	%b	n	%b
2000–2001	Total	509	59	11.6	50	84.7	9	15.3
2001–2002	Total	536	24	4.5	19	79.2	5	20.8
2002–2003	Total	393	97	24.7	55	56.7	42	43.3
2003–2004	Total	315	41	13.0	40	97.6	1	2.4
2004–2005	Total	827	155	18.7	115	74.2	40	25.8
2005–2006	Total	731	134	18.3	8	6.0	126	94.0
2006–2007	Total	723	118	16.3	118	100.0	0	0.0
2007–2008	Total	729	197	27.0	135	68.5	62	31.5
2008–2009	Total	781	205	26.2	157	76.6	48	23.4
2009–2010	Sentinel	676	211	31.2	210	99.5	1	0.5
	Non-sentinel	3188	1064	33.4	1064	100.0	0	0.0
	Total	3864	1275	33.0	1274	99.9	1	0.1
2010–2011	Sentinel	535	211	39.4	140	66.4	71	33.6
	Non-sentinel	590	233	39.5	205	88.0	28	12.0
	Total	1125	444	39.5	345	77.7	99	22.3
2011–2012	Sentinel	578	151	26.1	117	77.5	34	22.5
	Non-sentinel	365	102	27.9	84	82.4	18	17.6
	Total	943	253	26.8	201	79.4	52	20.6
2012–2013	Sentinel	543	241	44.4	163	67.6	78	32.4
	Non-sentinel	1882	938	49.8	737	78.6	201	21.4
	Total	2425	1179	48.6	900	76.3	279	23.7
2013–2014	Sentinel	415	22	5.3	19	86.4	3	13.6
	Non-sentinel	203	11	5.4	11	100.0	0	0.0
	Total	618	33	5.3	30	90.9	3	9.1
2014–2015	Sentinel	471	216	45.9	126	58.3	90	41.7
	Non-sentinel	651	308	47.3	213	69.2	95	30.8
	Total	1122	524	46.7	339	64.7	185	35.3
2015–2016	Sentinel	492	139	28.3	70	50.4	69	49.6
	Non-sentinel	807	267	33.1	188	70.4	79	29.6
	Total	1299	406	31.3	258	63.5	148	36.5
All seasons	Total	16,940	5144	30.4	4044	78.6	1100	21.4

^aUntil 2009, sentinel and non-sentinel samples were reported together

^bProportion of influenza-positive cases