ABSTRACT
Cystic echinococcus is a chronic zoonotic parasitic disease. To investigate the white blood cells changes in mice following the infestation with gamma rays radiant [and not radiant] fertile protoscolices. 120 mice were divided into six equal groups: groups A. B, C, D and E were administered intraperitoneal gamma rays radiant fertile protoscolices 5, 10, 15, 20 and 25 Gray. After a month with the challenge dose, blood picture were measured and compared to those of the natural infection or the control. The differential white blood cells count for the groups A and B with 5 and 10 Gray, showed increase of neutrophil, but decrease of Lymphocytes from the first week to the eighth week. The study showed that there was no change in the number of monocytes and eosinophils during the same period for all groups. Groups C and D [20 and 25 Gray] showed the increase of Lymphocytes, but decrease of neutrophil. Controls showed increase of neutrophlis, monocytes, eosinophils, but decrease of Lymphocytes