Figs. 1.

Clinical disease progression and plasma viral load in horses A2140 and A2147. Rectal temperatures above the horizontal line were considered febrile (>38.6°C), while platelet counts below the horizontal line were considered thrombocytopenic (<150,000 platelets/μl whole blood). Clinical disease was defined as thrombocytopenia with or without fever, concurrent with detectable plasma virus. Plasma EIAV RNA copies/ml are indicated with “*”. Samples in which virus was not detected are indicated with “◇” on the x-axis.