Abstract
The rabbit ear chamber provides a thin layer of living vascularized tissue 40-50[mu] thick which can be inoculated directly with living virulent tubercle bacilli. The course of infection can be observed in the living animal over a period of weeks and months, and serial microscopic observations can be made on the same tuberclf Cortisone produced a quantitative reduction in the inflammatory response of the hypersensitive rabbit to tuberculous infection. Changes noted were: vascular tone was better maintained, damage to the arteriolar and venule endothelium was reduced, and diapedesis and amt. of exudate were reduced.