1 Louisiana State University, School of Veterinary Medicine, Department of Veterinary Clinical Sciences, Baton Rouge, LA 70803, USA, aemasri@ucdavis.edu.
2 Louisiana State University, School of Veterinary Medicine, Department of Veterinary Clinical Sciences, Baton Rouge, LA 70803, USA.
3 Department of Pathobiological Sciences and Louisiana Animal Disease Diagnostic Laboratory, Baton Rouge, LA 70803, USA.