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A recombinant fowl adenovirus expressing the S1 gene of infectious bronchitis virus protects against challenge with infectious bronchitis virus

A recombinant fowl adenovirus expressing the S1 gene of infectious bronchitis virus protects against challenge with infectious bronchitis virus

Vaccine 21(21-22): 2730-2736

ISSN/ISBN: 0264-410X

PMID: 12798610

DOI: 10.1016/s0264-410x(03)00227-5

The spike peplomer S1 subunit sequence from avian infectious bronchitis virus (IBV) Vic S strain was expressed in a plasmid under the control of the fowl adenovirus (FAV) major late promoter (MLP). Two recombinants were constructed in FAV serotype 8 (FAV 8) by inserting the expression cassette between the SnaBI and XbaI restriction enzyme sites (clone DA3) or between the SpeI sites (clone CA6-20). Expression of the S1 gene in the recombinants was confirmed by reverse transcription-polymerase chain reaction (RT-PCR) by 20h post-infection. Commercial broiler chickens were orally vaccinated at day 0 or day 6 post-hatch and challenged at day 35 post-hatch. FAV antibody ELISA confirmed that maternal antibody directed against inclusion body hepatitis (serotype 8) had decayed in control birds and that FAV specific serum IgG responses were produced in vaccinated birds at the time of challenge. Further, an S1 specific antibody response was detected prior to challenge. Birds were challenged with either Vic S (serotype B) or N1/62 (serotype C) strains of IBV. The tracheas of challenged birds were analyzed by RT-PCR and re-isolation of virus. In birds vaccinated at day 6, 90-100% protection at the trachea was induced against either homologous or heterologous challenge. The construction of a recombinant FAV expressing S1 of IBV demonstrates the potential of an alternative vaccination strategy against IBV.

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Accession: 003626568

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