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- [45] ORAL IMMUNIZATION AGAINST POCK DISEASES .4. RELATIONSHIP BETWEEN LEVEL OF ATTENUATION OF VACCINE VIRUS, VIRULENCE FOR DAY-OLD CHICKS AND SUITABILITY FOR ADMINISTRATION IN DRINKING-WATER ZENTRALBLATT FUR VETERINARMEDIZIN REIHE B-JOURNAL OF VETERINARY MEDICINE SERIES B-INFECTIOUS DISEASES IMMUNOLOGY FOOD HYGIENE VETERINARY PUBLIC HEALTH, 1973, 20 (09): : 685 - 695