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Archives of Virology

, Volume 140, Issue 2, pp 259–271 | Cite as

A novel variant of avian infectious bronchitis virus resulting from recombination among three different strains

  • W. Jia
  • K. Karaca
  • C. R. Parrish
  • S. A. Naqi
Original Papers

Summary

An antigenic variant of avian infectious bronchitis virus (IBV), a coronavirus, was isolated and characterized. This strain, CU-T2, possesses a number of unusual features, which have not been previously observed in IBV. The S1 glycoprotein of CU-T2 carries virus-neutralizing and serotype-specific epitopes of two IBV serotypes, Arkansas (Ark) and Massachusetts (Mass). Sequence analysis revealed that the virus, originally an Ark serotype, has acquired the Mass-specific epitope by mutation(s). This provides evidence that point mutations may lead to generation of IBV antigenic variants in the field. It was further observed that two independent recombination events involving three different IBV strains had occurred in the S2 glycoprotein gene and N protein gene of CU-T2, indicating that genomic RNA recombination in IBV may occur in multiple genes in nature. It was especially significant that a sequence of Holland 52 (a vaccine strain) had replaced half of the N gene of CU-T2. This proves that recombination among vaccine strains is contributing to the generation of IBV variants in the field. Based on these observations it is predicted that every IBV field isolate could have unique genetic nature. Therefore, several recently reported diagnostic and serotyping methods of IBV which are based on dot-blot hybridization, restriction fragment length polymorphism (RFLP), and polymerase chain reaction (PCR), may not reveal the true antigenic and/or genetic nature of IBV isolates, and may in fact yield misleading information.

Keywords

Vaccine Strain Infectious Bronchitis Virus Antigenic Variant Genetic Nature Fact Yield 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • W. Jia
    • 1
  • K. Karaca
    • 1
  • C. R. Parrish
    • 2
  • S. A. Naqi
    • 1
  1. 1.Department of Avian and Aquatic Animal Medicine, College of Veterinary MedicineCornell UniversityIthacaUSA
  2. 2.The James A. Baker Institute for Animal Health, College of Veterinary MedicineCornell UniversityIthacaUSA

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