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Exchange of the C-terminal Part of VP3 from Very Virulent Infectious Bursal Disease Virus Results in an Attenuated Virus with a Unique Antigenic Structure

Overview
Journal J Virol
Date 2002 Sep 20
PMID 12239311
Citations 5
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Abstract

Infectious bursal disease virus (IBDV) is the major viral pathogen in the poultry industry. Live attenuated serotype 1 vaccine strains are commonly used to protect susceptible chickens during their first 6 weeks of life. Wild-type serotype 1 IBDV strains are highly pathogenic only in chickens, whereas serotype 2 strains are apathogenic in chickens and other birds. Here we describe the replacement of the genomic double-stranded RNA (dsRNA) encoding the N- or C-terminal part of VP3 of serotype 1 very virulent IBDV (vvIBDV) (isolate D6948) with the corresponding part of serotype 2 (isolate TY89) genomic dsRNA. The modified virus containing the C-terminal part of serotype 2 VP3 significantly reduced the virulence in specific-pathogen-free chickens, without affecting the distinct bursa tropism of serotype 1 IBDV strains. Furthermore, by using serotype-specific antibodies we were able to distinguish bursas infected with wild-type vvIBDV from bursas infected with the modified vvIBDV. We are currently evaluating the potential of this recombinant strain as an attenuated live vaccine that induces a unique serological response (i.e., an IBDV marker vaccine).

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