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USDA/HHS Overlap Agents and Toxins

USDA Only Agents - Plants

     Livestock

*Denotes Tier 1 Agent

[1]A virulent Newcastle disease virus (avian paramyxovirus serotype 1) has an intracerebral pathogenicity index in day-old chicks (Gallus gallus) of 0.7 or greater or has an amino acid sequence at the fusion (F) protein cleavage site that is consistent with virulent strains of Newcastle disease virus. A failure to detect a cleavage site that is consistent with virulent strains does not confirm the absence of a virulent virus.

Effective 12/04/2012

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Last Modified: October 19, 2012