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Equine rhinitis A virus strain 393/76 (ERAV.393/76) was passaged in the presence of post-infection ERAV.393/76 equine polyclonal antiserum (EPA). Viruses with increased resistance to neutralization by EPA were obtained after 15 passages. Compared with the parent virus, five plaque-purified, neutralization-resistant mutant viruses, in addition to the non-plaque-purified viruses that were examined, had a Glu--&gt;Lys change at position 658, which is located in the predicted betaE-betaF (EF) loop of VP1. Rabbit antiserum was prepared against the isolated EF loop of ERAV.393/76 VP1 expressed as a fusion protein with glutathione S-transferase. This antiserum bound to purified ERAV.393/76 in Western blots, but not to the neutralization-resistant mutant virus or to ERAV.PERV/62, a naturally occurring ERAV strain that has a Lys residue at position 658. These results suggest that the EF loop of VP1 is involved in a neutralization epitope of ERAV.

Identification of a neutralizing epitope in the βE–βF loop of VP1 of equine rhinitis A virus, defined by a neutralization-resistant variant