“…Stern saw no point, therefore, in speculating about the specific etiology, but was convinced that the epidemiological and pathological evidence contributed by Economo, himself and others was sufficient to establish the separateness of the two disorders, and that the relationship, if any, was quite complex and far from obligate. Influenza might act as an agent provocateur , according to Stern, but it was not specific; measles (Capaldo 1932), typhus (Nagtegaal 1927; Rabinowitsch 1928) and malaria (Wilson 1921) could also elicit EL-like symptoms. Indeed, the similarity of EL and a number of other encephalitides with no connection to influenza – Japanese encephalitis, poliomyelitis and post-vaccinal encephalitis – was indirect evidence for the frailty of the unitary EL/influenza hypothesis (Stern 1936).…”