Details of the two NDV isolates investigated in this study.

a

Mean death time in embryonating eggs (hours) (<60: velogen; 60–90: mesogen; >90: lentogen).

b

Intracerebral pathogenicity index in day-old chicks (1.5–2.0: velogen; 1.0–1.5: mesogen; <0.5: lentogen).

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