TABLE 2.

Influenza type A sequences used in the sequence analysis

Virus	No. of sequences used for the indicated segmenta
	1	2	3	4	5	6	7	8	Total
H1N1 (old)	1,066	1,065	1,053	1,881	1,132	1,930	1,294	1,123	10,544
H1N1 (2009)	268	268	258	234	341	314	425	311	2,419
H3N2	1,989	2,000	1,971	3,019	2,136	3,373	2,675	2,169	19,332
H2N2	101	96	101	89	104	118	105	110	824
H5N1	1,211	1,183	1,223	2,192	1,259	1,766	1,437	1,493	11,764
H6N1	80	85	85	168	82	170	158	159	987
H9N2	262	257	263	775	321	687	679	672	3,916
Others	1,747	1,778	1,751	2,386	1,592	2,091	1,837	1,871	15,053
Total	6,724	6,732	6,705	10,744	6,967	10,449	8,610	7,908	64,839

^aInfluenza virus sequences were downloaded from GenBank on 20 July 2009 and are grouped by serotype for each segment.