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Table 1 Pathological characteristics of NA-1, rNA-1, and rNA-1(−)

From: The deletion of an extra six nucleotides in the 5′ -untranslated region of the nucleoprotein gene of Newcastle disease virus NA-1 decreases virulence

Virus MDT a ICPI bfrom chicken ICPI bfrom goose
NA-1 59.6 h 1.65 1.60
rNA-1 59 h 1.62 1.60
rNA-1(−) 62 h 1.52 1.35
  1. aLentogenic strains, MDT > 90 h; mesogenic strains, MDT = 60–90 h; velogenic strains, MDT < 60 h.
  2. bLentogenic strains, ICPI < 0.7; mesogenic strains, ICPI = 0.7–1.5; velogenic strains, ICPI = 1.5–2.0.