“…The PCR procedure is considered a useful laboratory tool for the identification of suspected O. rhinotracheale isolates (van Empel and Hafez, 1999;Chansiripornchai et al, 2007;Hung and Alvarado, 2001;Gornatti Churria et al, 2011;, and also for diagnostic or investigation purposes (van Empel and Hafez, 1999;Canal et al, 2003b;Eroksuz et al, 2006;Tsai and Huang, 2006;Pyzik et al, 2007). The primers OR16S-F1 (5´-GAGAATTAATTTACGGATTAAG-3´), and OR16S-R1 (5´-TTCGCTTGGTCTCCGAAGAT-3´) have allowed the amplification of a 784 bp fragment on the 16S rRNA gene of O. rhinotracheale (van Empel and Hafez, 1999;Hafez, 2002;Hung and Alvarado, 2001;Canal et al, 2003;Eroksuz et al, 2006;Tsai and Huang, 2006;Chansiripornchai et al, 2007;Pyzik et al, 2007;Uriarte et al, 2009;Gornatti Churria et al, 2011;.…”