“…leprae It has now been established (Rees, 1965a(Rees, , 1965bRees & Weddell, 1968;Rees et al, 1967) and confirmed (Gaugas, 1967;Shepard & Congdon, 1968) that when the immunological capacity of mice is. reduced by thymectomy plus irradiation (with 900 r), Myco.…”