Cerebral Pathogenicity Index( ICPI) Value of Newcastle Disease

NDV in poultry

Newcastle Disease: Vaccine Strain With Cerebral Pathogenicity Index( ICPI) Value

Strain of Vaccine

A vaccine is a biological preparation that provides active acquired immunity to a particular disease in the host after applying via orally or parenteral route

Virus for used for preparation of vaccine called strain of vaccine. Either its parts of virus or whole body uses this purpose to produce immunuty in the body.

Intracerebral pathogenicity index

The Intracerebral pathogenicity index is a test to see how virulent a virus is

Intracerebral pathogenicity index value

Its define as a determination of virulency of vaccine virus which ability to causing diseases in day old chicks.

he most virulent Ndv viruses will give a maximum score of 2.0 in this test, whereas whereas lentogenic and asymptomatic enteric strains will give values close to 0.0 which indicates NDV unable to produce disease into host.

Commonly used live lentogenic (loNDV) vaccine strains, mesogenic vaccine strains, and virulent challenge virus strains and their genotype and pathogenicity indices for chickens :

Varus strain Pathotypes Genotypes ICPI value
Ulster 2CAsymptomatic I 0.0
QV4 Asymptomatic I 0.0
VG/GAAsymptomatic/ lentogenic II 0.0
Hitchner B1 lentogenic II 0.2
LaSota lentogenic II 0.4
Mukteswar Mesogenic IV 1.4
Roakin Mesogenic II 1.5
Beaudette C Mesogenic II 1.6
TXGB Velogenic II 1.8
Herts
33/1956
Velogenic III 1.9
CA/2002 Velogenic Vb 1.8
ZJ1 Velogenic VIId 1.9

Reference diseases of poultry, 13th edition

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