Table 2.

Influenza virus types and influenza A subtypes detected by year

Year	ILI cases		RT‐PCR		# Isolates	# and (%) of Influenza Positives with isolates
			# Influenza Positive	% of all Influenza Positives
2003	593	Influenza A
		H1N1	10	9.0	7	7/10 (70)
		H3N2	75	67.6	34	34/75 (45.3)
		Influenza B	26	23.4	9	9/26 (34.6)
		Total	111/593	18.7	50	50/111 (45)
2004	1403	Influenza A
		H1N1	12	3.6	8	8/12 (66.7)
		H3N2	219	65.6	94	94/219 (42.9)
		Influenza B	103	30.8	70	70/103 (67.9)
		Total	334/1403	23.8	172	172/334 (51.5)
2005	3964	Influenza A
		H1N1	59	7.9	22	22/59 (37.3)
		H3N2	303	40.5	47	47/303 (15.5)
		H5N1	1	0.1
		Influenza B	336	51.5	233	233/386 (60.4)
		Total	749/3964	I8.9	302	302/748 (40.4)*
2006	6926	Influenza A
		A Not further tested	108	8.6
		H1N1	422	33.5	196	196/422 (46.4)
		H3N2	343	27.2	54	54/343 (15.7)
		H5N1	3	0.2
		Influenza B	384	30.5	167	167/326 (51.2)**
		Total	1260/6926	18.2	417	417/1091 (38.2)*
2007	8144	Influenza A
		A Not further tested	327	18.4
		H1N1	305	17.1	89	89/305 (29.2)
		H3N2	556	31.2	51	51/556 (9.2)
		H5N1	6	0.3
		Influenza B	538	32.9	183	183/470 (38.9)**
		Total	1782/8144	21.9	323	323/1331 (24.3)*

*Excludes H5N1 viruses and specimens not further tested.

**Denominator differs from all influenza B virus positive specimens detected by RT‐PCR.