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Mean HN antibody titers assayed by HI test (log2) of SPF chickens after immunization with different vaccination programs (geometric mean ± sd)
| Mean HI titers | ||||
|---|---|---|---|---|
| Group names | 20 days old chicken | 30 days old chicken | Two-week post third vaccination | Alive chickens after 6 days post challenge |
| NDV-VLPs | 1.5 ± 0.67 | 2.1 ± 0.32 | 5.96 ± 0.73 | 6out of 6 (100%) |
| NDV-VLPs boosted with B1 vaccine | 1.3 ± 0.56 | 2.3 ± 0.15 | 7.89 ± 0.87.5 | 4 out of 6 (66%) |
| Control | 0.00 | 0.00 | 0.00 | 0 out of 6 (0%) |
