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INFLUENZA VIRUSES ISOLATED BY
WHO/NREVSS Collaborating Laboratories
2003 - 2004 Season

Week	A(H1N1) & A(H1N2)	A(H3N2)	A(Unk)	B	Total # Tested	% Positive
40	0	2	13	1	1105	1.4
41	0	3	39	0	1286	3.3
42	0	18	16	0	1239	2.7
43	0	57	539	4	3039	19.7
44	0	99	307	0	2097	19.4
45	1	258	432	3	2703	25.7
46	0	366	700	0	3637	29.3
47	0	538	1202	6	4597	38.0
48	0	364	1744	11	6623	32.0
49	0	711	1923	26	7582	35.1
50	0	711	2076	24	8702	32.3
51	0	520	1604	17	6998	30.6
52	0	168	1019	11	5131	23.3
53	0	111	524	6	3092	20.7