Correction to: Vet Res (2017) 48:68 https://doi.org/10.1186/s13567-017-0475-9

After publication of the article [1], it has been brought to our attention that Newcastle disease virus was incorrectly labeled as a Tier 1 USDA Select Agent. Newcastle disease virus is a USDA Select Agent but it is not a Tier 1 agent.