NDV in poultry

Intracerebral Pathogenicity Index( ICPI) Value

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Intracerebral Pathogenicity Index Value

Intracerebral Pathogenicity Index( ICPI) Value is defined as numeric referring which denotes how much a Newcastle disease virus showing virulence on the day-old chicks. The term virulence means the ability of the pathogen to infect the host.

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

Viruses for used for the preparation of vaccines called strain of vaccine. Either its parts of the virus or whole body use this purpose to produce immunity in the body.

Intracerebral pathogenicity index

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

Intracerebral pathogenicity index value

In other word, the Intracerebral pathogenicity index value defines as a determination of virulence of vaccine virus which ability to causing diseases in day-old chicks.

The 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.

Table of ICPI Value

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

Related Post

Newcastle Disease: Cerebral Pathogenicity Index

Newcastle Disease: Strain, Etiology, Clinical Sign, Postmortem Findings &Treatment

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