Table 3. Egg yolk HI antibodies against three clades (clade 0, clade 7, clade 2.3.4) of H5N1 AIV.
| HI antibodies to H5N1 AIV (%) | ||||||||
|---|---|---|---|---|---|---|---|---|
| Species | HI titers | Re-1 | Re-4 | Re-5 | Re-1/Re-4 | Re-1/Re-5 | Re-4/Re-5 | Re-1/Re-4/Re-5 |
| Little Egrets | <4 | 5/29 (17.24) | 1/29 (3.45) | 2/29 (6.9) | 4/29 (13.79) | 2/29 (6.9) | 2/29 (6.9) | 2/29(6.9) |
| 4–6 | 5/29 (17.24) | 12/29 (41.38) | 0/29 (0) | 5/29 (17.24) | 0/29 (0) | 0/29 (0) | 0/29(0) | |
| >6 | 0/29 (0) | 6/29 (20.69) | 0/29 (0) | 0/29 (0) | 0/29 (0) | 0/29 (0) | 0/29(0) | |
| Black-crowned Night Herons | <4 | 1/35 (2.86) | 1/35 (2.86) | 1/35 (2.86) | 1/35 (2.86) | 1/35 (2.86) | 1/35 (2.86) | 1/35(2.86) |
| 4–6 | 3/35 (8.57) | 14/35 (40) | 1/35 (2.86) | 3/35 (8.57) | 0/35 (0) | 0/35 (0) | 1/35(2.86) | |
| >6 | 1/35 (2.86) | 3/35 (8.57) | 0/35 (0) | 0/35 (0) | 0/35 (0) | 0/35 (0) | 0/35(0) | |
HI, hemagglutination-inhibition; AIV, avian influenza virus.
H5N1 Re-1, H5N1 Re-4 and H5N1 Re-5 AVIs belong to clade 0, clade 7, and clade 2.3.4, respectively.
Numerator indicates the number of HI-antibody-positive birds; denominator is the total number of examined birds.