Nasopharyngeal swabs (preferred), pharyngeal swabs, or nasal swabs in viral transport medium, buffy coat, whole blood with EDTA (purple top) or heparin from an equine; shipped chilled overnight.

Brain or cerebral spinal fluid (neurologic cases), fresh or frozen fetal tissue (lung or spleen) from an equine in a leakproof and sterile tube or container; shipped chilled overnight.