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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.
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BMC Veterinary Research

ISSN: 1746-6148

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