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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	19	1	1301	1.7
41	0	3	74	0	1562	4.9
42	0	18	130	0	1809	8.2
43	0	57	398	4	2487	18.5
44	0	103	435	0	2649	20.3
45	1	273	584	3	3463	24.9
46	0	394	908	2	4508	28.9
47	0	592	1370	8	5795	34.0
48	0	488	1743	9	6363	35.2
49	0	977	2242	31	9337	34.8
50	0	1401	2616	26	11935	33.9
51	0	1082	2466	20	11382	31.3
52	0	568	1745	16	9292	25.1
53	0	462	1195	10	8286	20.1
01	0	280	571	9	6775	12.7
02	0	168	334	7	5343	9.5
03	0	95	150	1	4186	5.9
04	0	93	70	4	4058	4.1
05	1	46	56	1	3456	3.0
06	0	24	30	4	3338	1.7
07	0	28	18	8	2890	1.9
08	0	16	8	9	2309	1.4
09	0	4	6	7	2467	0.7
10	0	2	6	6	2192	0.6
11	0	4	6	1	2077	0.5
12	0	5	3	14	1580	1.4
13	0	3	5	8	1611	1.0
14	0	0	1	6	1539	0.5
15	0	0	3	12	1371	1.1
16	0	1	11	8	1266	1.6
17	0	0	4	6	1105	0.9
18	0	0	1	4	1061	0.5
19	0	0	0	2	957	0.2
20	0	0	1	2	827	0.4