TABLE 1.
Prevalence of H9N2 viruses from chickens, other minor poultry species, and ducks in southern China during 2000 to 2005
| Month | No. of H9N2 isolates/total sample no.
|
|||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chickens
|
Other minor poultry species
|
Ducks
|
||||||||||||||||
| 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | |
| January | 1/161 | 5/70 | 10/844 | 13/817 | 110/2,056 | 4/43 | 33/79 | 1/42 | 29/224 | 9/254 | 0/502 | 1/200 | 0/769 | 3/587 | 2/1,380 | |||
| February | 15/215 | 4/8 | 2/440 | 10/666 | 46/1,432 | 0/11 | 9/36 | 2/52 | 6/176 | 1/150 | 0/191 | 0/162 | 0/428 | 0/361 | 1/1,035 | |||
| March | 3/182 | 0/35 | 2/689 | 11/834 | 26/1,651 | 0/15 | 3/39 | 1/45 | 10/308 | 0/162 | 2/149 | 0/102 | 0/681 | 0/696 | 0/1,396 | |||
| April | 13/178 | 0/49 | 1/603 | 11/732 | 84/2,204 | 0/5 | 0/47 | 0/47 | 0/206 | 0/138 | 2/118 | 0/108 | 0/561 | 0/695 | 1/1,972 | |||
| May | 0/176 | 0/48 | 2/652 | 1/757 | 67/2,023 | 1/6 | 0/36 | 0/19 | 0/181 | 0/150 | 14/121 | 0/114 | 0/576 | 0/635 | 0/2,153 | |||
| June | 1/162 | 11/256 | 0/604 | 0/733 | 31/1,931 | 3/8 | 0/19 | 0/49 | 0/220 | 0/204 | 5/115 | 0/125 | 0/533 | 0/663 | 1/2,089 | |||
| July | 14/203 | 2/181 | 0/123 | 0/646 | 0/843 | 22/1,881 | 8/60 | 1/11 | 0/18 | 0/40 | 1/207 | 2/174 | 0/119 | 1/135 | 0/341 | 0/567 | 0/818 | 0/2,426 |
| August | 0/115 | 1/154 | 0/115 | 3/584 | 6/1,071 | 27/1,803 | 0/35 | 0/19 | 0/49 | 3/85 | 0/266 | 1/188 | 0/100 | 1/168 | 0/152 | 0/494 | 0/994 | 2/3,034 |
| September | 5/172 | 2/139 | 0/132 | 1/707 | 13/922 | 75/1,725 | 0/89 | 5/28 | 0/43 | 0/99 | 16/241 | 0/160 | 4/131 | 8/211 | 0/190 | 0/605 | 0/952 | 6/2,214 |
| October | 2/242 | 6/177 | 2/537 | 3/725 | 8/994 | 119/1,755 | 0/46 | 5/27 | 0/79 | 4/68 | 39/244 | 3/256 | 0/58 | 3/205 | 1/339 | 6/595 | 0/1,051 | 6/2,574 |
| November | 26/199 | 10/154 | 28/860 | 10/699 | 45/1,360 | 41/1,679 | 8/36 | 6/27 | 6/36 | 14/134 | 21/274 | 0/164 | 2/131 | 3/210 | 4/889 | 2/627 | 1/1,241 | 0/2,670 |
| December | 10/106 | 21/181 | 12/685 | 32/899 | 37/1,738 | 126/1,702 | 5/38 | 5/71 | 3/33 | 33/227 | 15/212 | 12/170 | 4/120 | 4/175 | 1/625 | 0/765 | 1/1,097 | 0/2,910 |
| Total | 57/1,037 | 75/2,060 | 62/2,918 | 66/8,092 | 155/11,467 | 774/21,842 | 21/304 | 30/271 | 54/514 | 58/907 | 137/2,759 | 28/2,170 | 10/659 | 41/2,300 | 6/3,347 | 8/7,201 | 5/9,790 | 19/25,853 |
aThe isolation rates for chickens in 2000 to 2005 were 5.5%, 3.6%, 2.1%, 0.8%, 1.4%, and 3.5%, respectively. The isolation rates for other minor poultry species in 2000 to 2005 were 6.9%, 11.1%, 10.5%, 6.4%, 5.0%, and 1.3%, respectively. The isolation rates for ducks in 2000 to 2005 were 1.8%, 1.8%, 0.17%, 0.12%, 0.06%, and 0.07%, respectively.