Table 2.

Results of virological surveillance in Apulia, Italy

Flu season	Samples (N)	A(H3N2)	A(H1N1)	A (non-subtyped)	B	Positive	Negative	Pos. sample (%)
1999–2000	70	18	—	—	—	18	52	25·7
2000–2001	30	—	10	—	—	10	20	33·3
2001–2002	75	—	—	—	6	6	69	8·0
2002–2003	64	33	—	—	1	34	30	53·1
2003–2004	48	6	—	—	7	13	35	27·0
2004–2005	83	30	—	—	1	31	52	37·3
2005–2006	139	8	1	—	9	18	121	12·9
2006–2007	175	6	36	—	6	48	127	27·4
2007–2008	187	—	16	9	7	32	155	17·1
2008–2009	298	83	1	20	3	107	191	35·9
Total	1169	184	64	29	40	317	852