Table 2. Distribution of influenza A virus (IAV) nucleoprotein antigen in the gastrointestinal tract and bursa of Fabricius of mallards exposed to a H14N5 IAV through intranasal inoculation or contact exposure.
| Bird ID | Esophagus1 | Proventriculus | Duodenum | Jejunum | Ileum | Ceca | Colon | Bursa |
| Inoculated | ||||||||
| 32 | − | − | − | − | ++ | + | ++ | + |
| 33 | − | − | − | ++ | + | ++ | ++ | |
| Contact exposed | ||||||||
| 31 | − | − | − | − | − | − | − | |
| 34 | − | − | − | − | ++ | − | − | + |
Viral antigen was not identified in larynx, trachea, lung, brain, kidney, adrenal glands, pectoral skeletal muscle, heart, or liver. 1– = no staining; + = staining of a few cells; ++ = staining of moderate numbers of cells; +++ = staining of numerous cells.