BUSHELL, J. Coccidiosis control in chickens using a live attenuated vaccine. II. Field results. Coccidia and Cocciomorphs, 5th International Coccidiosis Conference, Tours (France), 1989. 1989, 680-692
JOHNSON, J. Anticoccidial dugs : lesion scoring techniques in battery and floor-pen experiments with chickens. Exp. Parasitol. 1970, 28, 30-36
JOHSON, J. K. The immune responses of young chickens given graded or trickle infections with coccidia. Research in Avian Coccidiosis. 1986, 634-641
LILLEHOJ, H. S. Eimeria acervulina : evaluation of the cellular and antibody responses to the recombinant coccidial antigens in B-congenic chickens. Exp. Parasitol. 1988, 67, 148-158