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Histology in different organs of SPF chicks inoculated with YN or aYN.
| Organs | Group | Days of sampling (post-inoculation) |
||||
|---|---|---|---|---|---|---|
| 3 | 5 | 7 | 10 | 15 | ||
| Trachea | YN | ++a | +++ | +++ | ++ | + |
| aYN | + | – | + | – | + | |
| Proventriculus | YN | + | + | ++ | + | – |
| aYN | – | – | + | – | – | |
| Duodenum | YN | – | – | – | – | – |
| aYN | – | – | – | – | – | |
| Bursa of Fabricius | YN | – | – | – | – | – |
| aYN | – | – | – | – | – | |
| Lung | YN | ++ | +++ | ++ | ++ | + |
| aYN | – | + | + | + | – | |
| Kidney | YN | +++ | ++ | +++ | ++ | + |
| aYN | – | + | + | – | – | |
Mean of the severity index from two chicks: -, no change; +, mild; + +, moderate; +++, severe.
