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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Epidemiological survey and molecular characterization of avian infectious bronchitis virus in Brazil between 2003 and 2009

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Author(s):
Chacon, Jorge Luis [1] ; Rodrigues, Juliana Nogueira [2] ; Assayag Junior, Mario Sergio [1] ; Peloso, Camila [1] ; Pedroso, Antonio C. [1] ; Piantino Ferreira, Antonio J. [1]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Dept Pathol, Coll Vet Med, Sao Paulo - Brazil
[2] Univ Sao Paulo, Virol Lab, Inst Biomed Sci, Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: AVIAN PATHOLOGY; v. 40, n. 2, p. 153-162, 2011.
Web of Science Citations: 25
Abstract

As part of an epidemiological study of infectious bronchitis virus (IBV) in Brazil, 252 samples from IBV-suspect flocks were tested and the IBV-positive samples were analysed by sequencing of hypervariable regions 1 and 2 of the S1 gene. A high prevalence of IBV variants was found and the sequence analysis of 41 samples revealed a high molecular similarity among the Brazilian isolates (from 90.2 to 100% and from 85.3 to 100% nucleotide and amino acid identity, respectively). The Brazilian isolates showed low genetic relationship with Massachusetts (63.4 to 70.7%), European (45.9 to 75.6%), American (49.3 to 76.4%) and other reference serotypes (67.5 to 78.8%). The Brazilian isolates branched into one unique cluster, separate from the reference serotypes used for infectious bronchitis control in other countries. The variants analysed in this work had a high similarity with all previously published Brazilian IBV isolates, suggesting the presence and high prevalence of a unique or predominant genotype circulating in Brazil. In addition, the virus neutralization test showed that the three Brazilian isolates analysed in the present study are antigenically related to one another but are different from the Massachusetts serotype. The present study shows that IBVs of a unique genotype can be associated with different clinical diseases, and that low genetic variation was detected in this genotype over a long period of time. The molecular characterization of the Brazilian variants isolated from 2003 to 2009 from different geographic regions of the country shows that only one predominant genotype is widespread in the Brazilian territory, denominated in this study as BR-I genotype. (AU)