Control testing were screened for respiratory viruses using previously optimized and described PCR and reverse transcriptase PCR assays. Virus testing assays included: rhinovirus (RV) [26], influenza viruses (A and B) [27], respiratory syncytial viruses (A and B) [28], parainfluenza viruses (1?) [29], human adenoviruses [22], humanTable 1 Oligonucleotide primers for equine herpes virus-1 (EHV 1) a