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Equine rhinitis B virus: a new serotype

Centre for Equine Virology, School of Veterinary Science, The University of Melbourne, Victoria 3010, Australia¹
Institute of Veterinary Virology, University of Berne, Berne, Switzerland²

Author for correspondence: Jin-an Huang. Fax +61 3 83447374. e-mail jinah{at}unimelb.edu.au

Equine rhinovirus serotype 3 isolate P313/75 was assigned, with an unclassified genus status, to the family Picornaviridae. The sequence from the 5' poly(C) tract to the 3' poly(A) tract of P313/75 was determined. The sequence is 8821 bases in length and contains a potential open reading frame for a polyprotein of 2583 amino acids. Sequence comparison and phylogenic analysis suggest that P313/75 is most closely related to the prototype equine rhinitis B virus (ERBV) strain P1436/71, formerly named equine rhinovirus type 2. A high degree of sequence similarity was found in the P2 and P3 regions of the two genomes. However, the deduced amino acid sequences of the P1 region of P313/75 and ERBV strain P1436/71 contained significant differences, which presumably account for the serological segregation of the two viruses. It is suggested that P313/75 can be classified as a new serotype of the genus Erbovirus, tentatively named ERBV2. Seroepidemiological data indicate that ERBV2 infection of horses may be common (24%) in Australia.

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				W. D. Black and M. J. Studdert Formerly unclassified, acid-stable equine picornaviruses are a third equine rhinitis B virus serotype in the genus Erbovirus. J. Gen. Virol., October 1, 2006; 87(Pt 10): 3023 - 3027. [Abstract] [Full Text] [PDF]

				W. D. Black, C. A. Hartley, N. P. Ficorilli, and M. J. Studdert Sequence variation divides Equine rhinitis B virus into three distinct phylogenetic groups that correlate with serotype and acid stability J. Gen. Virol., August 1, 2005; 86(8): 2323 - 2332. [Abstract] [Full Text] [PDF]