Body temperature, nasal shedding and viremia following experimental EHV-1 infection in experiment 3. A. Median body temperature expressed in °C, B. Median nasal viral shedding in nasal secretions expressed as EHV-1 gB copies, C. Median viremia in PBMCs expressed as log gB copies/106 β-actin copies. Horses infected with the parental virus strain Ab4 (n = 6): -∆-, horses infected with Ab4GFP (n = 6): -Ο-.