INFLUENZA VIRUSES ISOLATED BY
WHO/NREVSS Collaborating Laboratories
2002 - 2003 Season

Week	Number of Labs Reporting	Total Specimens Tested	A(H1N1) & A(H1N2)	A(H3N2)	A(Unk)	B	Total Isolates	% Positive
40	110	1443	0	0	0	0	0	0.0
41	106	1517	1	0	1	1	3	0.2
42	114	1590	0	0	0	0	0	0.0
43	115	1774	4	0	1	1	6	0.3
44	117	1636	0	0	3	3	6	0.4
45	122	1988	0	2	0	3	5	0.3
46	123	2107	0	0	6	4	10	0.5
47	127	2091	2	0	4	16	22	1.1
48	122	1900	1	3	5	6	15	0.8
49	124	2414	4	3	5	28	40	1.7
50	125	2493	8	2	14	73	97	3.9
51	128	2910	17	3	25	146	191	6.6
52	119	2368	17	6	18	119	160	6.8
01	126	2632	27	8	31	82	148	5.6
02	133	2828	50	19	46	134	249	8.8
03	133	3108	68	11	76	202	357	11.5
04	134	3352	105	24	142	276	547	16.3
05	137	4166	173	53	215	413	854	20.5
06	138	4874	279	76	332	598	1285	26.4
07	135	4676	253	115	299	517	1184	25.3
08	138	4416	253	126	249	368	996	22.6
09	131	4348	275	101	233	357	966	22.2
10	129	3633	199	87	179	214	679	18.7
11	131	3422	175	62	174	175	586	17.1
12	124	3435	169	77	133	124	503	14.6
13	125	2820	90	29	91	71	281	10.0
14	121	2352	40	32	88	41	201	8.5
15	109	2131	24	23	47	16	110	5.2
16	107	1777	13	20	33	23	89	5.0
17	100	1406	9	20	18	11	58	4.1
18	99	1222	16	16	16	20	68	5.6
19	93	1121	6	7	5	10	28	2.5
20	87	931	7	3	3	6	19	2.0
21	83	872	3	5	1	7	16	1.8
22	71	705	0	2	0	4	6	0.9
23	72	721	3	0	2	8	13	1.8
24	63	683	0	3	0	4	7	1.0
25	62	551	0	1	1	2	4	0.7
26	52	439	1	1	0	0	2	0.5
27	68	643	0	1	0	0	1	0.2
28	66	632	0	2	1	0	3	0.5
29	66	697	0	4	0	0	4	0.6
30	67	636	0	4	0	0	4	0.6
31	69	632	0	7	0	1	8	1.3
32	67	632	0	2	0	0	2	0.3
33	71	761	0	2	1	0	3	0.4
34	64	649	0	0	0	0	0	0.0
35	66	672	0	0	0	0	0	0.0
36	61	512	0	0	2	0	2	0.4
37	60	604	0	1	0	0	1	0.2
38	56	535	0	1	1	0	2	0.4
39	46	414	0	0	0	0	0	0.0
TOTALS	5212	96871	2292	964	2501	4084	9841	10.16