Protection achieved by a vaccination programme comprising mass and 793B type vaccines against recent variant IBV strains circulating in the Middle East.
Tímea Tatár-Kis, Edit Walkóné Kovács, Balázs Felföldi, Zsuzsa Nagy, I Kiss, Tamás Mató, Vilmos Palya, Michael Lierz, Ursula Heffels-Redmann, E. F. Kaleta, Julia Heckmann
Abstract