Warning: XSLTProcessor::transformToXml() [xsltprocessor.transformtoxml]: I/O warning : failed to load external entity "file:////srv-new/scielo/www/bases/xml/vac/v33/1025-0298-vac-33-e013324.xml" in /srv-new/scielo/www/htdocs/class.XSLTransformerPHP5.php on line 36 Using guinea pig as a model for evaluation of equine influenza vaccine