Seroprevalence to bovine immunodeficiency virus and lack of association with leukocyte counts in Italian dairy cattle - Cavirani, S; Donofrio, G; Chiocco, D; Foni, E; Martelli, P; Allegri, G; Cabassi, CS; DeIaco, B; Flammini, CF (Prev Vet Med, 1998)