1921
Volume 78, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645

Abstract

A vectored vaccine based on equine herpesvirus type 1 (EHV-1) was generated as an alternative for safe and efficient prophylaxis against Venezuelan equine encephalitis virus (VEEV) infection. Two-step () Red mutagenesis was used to insert VEEV structural genes into an infectious clone of EHV-1 vaccine strain RacH. The recombinant virus, rH_VEEV, efficiently and stably expressed VEEV structural proteins as detected by various antibodies, including a conformation-dependent monoclonal antibody to envelope glycoprotein E2. In addition, rH_VEEV was indistinguishable from parental bacterial artificial chromosome–derived virus with respect to growth properties in cultured cells. Immunization of mice with the vectored vaccine conferred full protection against lethal challenge infection using VEEV strain ZPC738 in the absence of neutralizing antibodies and in a dose-dependent manner. Analyses of IgG responses demonstrated production of VEEV-specific IgG1 and total IgG antibodies after vaccination, indicating that protection was dependent on either cytotoxic T cell responses or antibody-mediated protection unrelated to neutralizing activity.

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2008-01-01
2017-11-21
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  • Received : 24 Sep 2006
  • Accepted : 13 Jun 2007

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