Frequency of molecular detection of equine herpesvirus‐4 in nasal secretions of 3028 horses with upper airway infection. (17th June 2017) - Pusterla, N.; Bain, F.; James, K.; Mapes, S.; Kenelty, K.; Barnett, D. C.; Gaughan, E.; Craig, B.; Chappell, D. E.; Vaala, W.