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J Gen Virol 87 (2006), 3023-3027; DOI 10.1099/vir.0.81937-0

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© 2006 Society for General Microbiology

Short Communication

Formerly unclassified, acid-stable equine picornaviruses are a third equine rhinitis B virus serotype in the genus Erbovirus

Wesley D. Black and Michael J. Studdert

Centre for Equine Virology, School of Veterinary Science, The University of Melbourne, Parkville, VIC 3010, Australia

Correspondence
Michael J. Studdert
m.studdert{at}unimelb.edu.au

Acid-stable equine picornaviruses (ASPs) were identified as a distinct serotype of equine picornaviruses that were isolated from nasal swabs taken from horses with acute febrile respiratory disease in the UK and Japan, and were placed in the group of unclassified picornaviruses. The nucleotide sequence of the P1 region, encoding the capsid proteins, was determined for three ASP isolates from the UK and the sequences were aligned with published sequences of Equine rhinitis B virus (ERBV), genus Erbovirus, including acid-labile ERBV1 and ERBV2 and the recently identified acid-stable ERBV1. The ASPs belong to the same phylogenetic group, composed of five acid-stable ERBV1 isolates. ERBV1 rabbit antiserum neutralized the ASP isolates at approximately 1/10 titre relative to acid-stable and acid-labile ERBV1 isolates, supporting prior findings that ASPs are a distinct serotype, albeit cross-neutralizing weakly with ERBV1. The genus Erbovirus therefore presently comprises three serotypes: ERBV1, ERBV2 and the proposed ERBV3.

The GenBank/EMBL/DDBJ accession numbers for the sequences reported in this paper are: ERBV3.4442/75 (DQ108383); ERBV3.R4/75 (DQ108384); ERBV3.2484c/75 (DQ108385).






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