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Abstract
Had concluded from previous studies that vaccines viable commercial medium-and high-intensity birds gain partial protection after 7 days of immunization against infection Field severe intensity, respectively. The immunization of this vaccine could gain the protection of birds molecule after 7 days of immunization if the birds have been infected with the field. They concluded also that all live vaccines commercial high intensity may not protect birds against mortality, but not protected against atrophy Vabrice bag or pathological changes of the virus. There is also no changes in pathology in the vaccinated birds at the age of 15 days for birds that had not been treated, but there are significant differences in the birds vaccinated at the age of 25 days, especially fortified vaccine live so lethal because of the presence of antibodies of illiteracy in the Member lymph transferred from the mother in the early ages. As well as infection Palmazzolp ferocious No. (11) at any age does not prevent the pathological changes in organs and lymph that have already been vaccinated either the vaccine in a fiercely or medium intensity.