 Upon Russell's return, he submitted a report on Wright's research, which O'Reilly considered "a very valuable treatise on the epidemiology of this disease".He conducted trials at the Army Medical Museum comparing the efficacy of both an orally administered and an injected vaccine.He packed the vaccine in small single dosage using small glass ampoules which, unlike the 1 liter flasks used in the United Kingdom, ensured that all of the typhoid micro-organisms were killed.