| vNDV | velogenic Newcastle Disease Virus |
| ON | Oronasal |
| CLO | Cloacal |
| SPF | specified pathogen-free |
| Ch | Challenge |
| PFU | plaque forming unit |
| rHVT-ND | recombinant herpesvirus of turkeys-vectored Newcastle disease vaccine |
| PBS | phosphate-buffered saline |
| MDA | maternally derived antibodies |
| EID50 | 50% Embryo Infective Dose |
| n.a. | not applicable |
| D | day of age |
| w | week of age |
| SD | standard deviation |
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