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	1189	10	8237	20.2
01	0	280	571	9	6739	12.8
02	0	168	333	7	5297	9.6
03	0	95	150	1	4158	5.9
04	0	92	67	4	4004	4.1
05	1	46	56	1	3356	3.1
06	0	24	29	4	3217	1.8
07	0	28	18	8	2803	1.9
08	0	16	7	5	2093	1.3
09	0	4	4	6	2273	0.6
10	0	2	6	5	2015	0.6
11	0	4	5	0	1941	0.5
12	0	5	2	12	1441	1.3
13	0	3	5	8	1445	1.1
14	0	0	1	4	1375	0.4
15	0	0	3	9	1239	1.0
16	0	1	8	8	1056	1.6
17	0	0	4	6	945	1.1
18	0	0	1	4	747	0.7
19	0	0	0	1	641	0.2
20	0	0	1	0	411	0.2