TABLE 1.
Prevalence of H9N2 influenza viruses in quail from southern China from 2000 to 2005
| Month | No. of H9N2 isolates/no. sampled (isolation rate, %) in:
|
|||||
|---|---|---|---|---|---|---|
| 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | |
| January | 4/10 | 34/95 | 9/92 | 14/60 | 15/80 | |
| February | 11/27 | 0/0 | 0/52 | 3/60 | 0/61 | |
| March | 36/43 | 10/59 | 8/136 | 12/94 | 8/80 | |
| April | 16/69 | 0/65 | 0/134 | 0/66 | 1/80 | |
| May | 12/66 | 1/72 | 4/34 | 1/81 | 2/80 | |
| June | 5/60 | 0/52 | 2/74 | 0/86 | 0/70 | |
| July | 2/61 | 0/31 | 0/107 | 1/97 | 0/72 | 2/90 |
| August | 0/27 | 0/109 | 0/40 | 1/30 | 0/101 | 2/100 |
| September | 6/54 | 0/91 | 0/62 | 4/78 | 5/80 | 9/80 |
| October | 13/27 | 10/74 | 1/36 | 5/108 | 3/80 | 6/80 |
| November | 5/33 | 1/101 | 7/16 | 40/99 | 12/101 | 7/100 |
| December | 16/34 | 19/101 | 6/32 | 9/85 | 1/66 | 13/80 |
| Total | 42/236 (17.8) | 114/782 (14.6) | 59/636 (9.3) | 83/1,019 (8.1) | 51/947 (5.4) | 65/981 (6.6) |