Persistence of Eosinophil Rhythm after Splenectomy in Rats.

Abstract

Eosinophil counts were made from tail blood obtained twice daily from male Line-3 Black rats, some splenectomized, others sham-operated. Eosinophilia developed during the 1st few mos. after operation and regressed during the 4th mo. after operation. Irrespective of the degree of eosinophilia, the mean eosinophil counts of the groups of rats studied were higher by day than by night. In the strain of rats studied, the presence of the spleen is not essential for the maintenance of the eosinophil rhythm.