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	17	1	1231	1.6
41	0	3	52	0	1439	3.8
42	0	18	49	0	1463	4.6
43	0	57	571	4	3310	19.1
44	0	101	352	0	2359	19.2
45	1	268	505	3	3044	25.5
46	0	390	867	0	4144	30.3
47	0	577	1346	8	5423	35.6
48	0	438	1864	11	7151	32.3
49	0	910	2228	26	8785	36.0
50	0	1223	2568	24	10907	35.0
51	0	861	2356	19	10343	31.3
52	0	331	1684	14	9375	21.6
53	0	272	1077	8	6756	20.1
01	0	183	467	8	5280	12.5
02	0	99	235	4	3853	8.8
03	0	48	108	1	2701	5.8
04	0	55	56	1	3273	3.4
05	0	25	22	1	1322	3.6