Table 1. Comparison of age-related positive rate against the selected diseases for layer flocks monitored from 2015 to 2017
| Diseases | No. flock positive no. flock tested (%) |
| 0~1.5 wks1 | 1.5~3 wks | 3~10 wks | 10~20 wks | 20~30 wks | 30~40 wks | 40~50 wks | 50~60 wks | 60~70 wks | Over 70 wks |
| LPAI | 349/425 (82.1) | 63/126 (50) | 315/496 (63.5) | 1,043/1,185 (88) | 526/550 (95.6) | 157/174 (90.2) | 89/107 (83.1) | 67/78 (85.8) | 49/52 (94.2) | 49/49 (100) |
| ND | 483/483 (100) | 123/124 (99.2) | 521/528 (98.7) | 1,183/1,184 (99.9) | 547/548 (99.8) | 179/179 (100) | 116/116 (100) | 82/82 (100) | 52/52 (100) | 50/50 (100) |
| IB | 354/410 (86.3) | 75/124 (60.5) | 446/483 (92.3) | 1,051/1,063 (98.9) | 493/494 (99.8) | 148/148 (100) | 86/86 (100) | 65/66 (98.5) | 45/45 (100) | 34/35 (97.1) |
| aMPV | 48/85 (56.5) | 20/29 (69) | 70/139 (50.4) | 281/390 (72.1) | 195/205 (95.1) | 51/52 (98.1) | 22/22 (100) | 9/9 (100) | 8/8 (100) | 7/8 (87.5) |
| EDS’76 | 10/14 (71.4) | 2/4 (50) | 38/65 (58.5) | 178/239 (74.5) | 76/83 (91.6) | 22/23 (95.7) | 15/15 (100) | 16/16 (100) | 9/9 (100) | 18/18 (100) |
| IBD | 17/19 (89.5) | 3/4 (75) | 33/33 (100) | 2/2 (100) | 1/1 (100) | 0/0 | 2/2 (100) | 0/0 | 0/0 | 0/0 |
| CIA | 2/11 (18.2) | 1/1 (100) | 22/25 (88) | 0/1 (0) | 0/0 | 0/0 | 1/1 (100) | 0/0 | 0/0 | 0/0 |
| MS | 36/108 (33.3) | 6/13 (46.2) | 17/61 (27.9) | 39/61 (63.9) | 18/19 (94.7) | 2/2 (100) | 0/3 (0) | 1/1 (100) | 1/1 (100) | 0/1 (0) |
LPAI, low pathogenic avian influenza; ND, Newcastle disease; IB, infectious bronchitis; aMPV, avian metapneumovirus infection; EDS’76, Egg drop syndrome’76; IBD, infectious bursal disease; CIA, chicken infectious anemia; MS, Mycoplasma synoviae.
The age range in weeks old.