On typhoid and typhus fevers, – an attempt to determine the question of their identity or non-identity, by an analysis of the symptoms, and of the appearances found after death in 66 fatal cases observed at the London Fever Hospital from Jan. 1847–Feb. 1849.

Despite Stewart’s work, there was still controversy as to the identity of typhoid and typhus. Jenner’s paper demonstrated that the etiology of the two was quite different, that one did not communicate or protect against the other, and that epidemics of the two did not prevail simultaneously.