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This article explores the decisive role of British military medicine in shaping official approaches to the 1918 influenza pandemic. It contends that British approaches were defined through a system of military pathology, which had been established by the War Office as part of the mobilization of medicine for the First World War. Relying on the bacteriological laboratory for the identification and control of pathogenic agents, military pathology delivered therapeutic and preventive measures against a range of battlefield diseases, and military and civilian authorities trusted that it could do the same with influenza. This article traces how it shaped efforts to establish the etiology of the pandemic and to produce a general influenza vaccine. It highlights the challenges involved in both strategies. Understanding the central role of military pathology helps make sense of the nature, direction, scale, and limitations of medical mobilization against the pandemic in Britain and the authority accorded to specific medical bodies for elaborating and coordinating strategies. Crucially, it demands that we rethink the relationship between the war and pandemic as one about the social organization of medical knowledge and institutions.

Bacterial vaccines of various sorts were widely used for both preventive and therapeutic purposes during the great influenza pandemic of 1918-19. Some were derived exclusively from the Pfeiffer's bacillus, the presumed cause of influenza, while others contained one or more other organisms found in the lungs of victims. Although initially most reports of the use of these vaccines claimed that they prevented influenza or pneumonia, the results were inconsistent and sometimes contradictory. During the course of the debates over the efficacy of these vaccines, it became clear that the medical profession had no consensus on what constituted a proper vaccine trial. Even among those who asserted that clinical impression was not enough, there was no agreement on how a trial ought to be conducted. The American Public Health Association, through its Working Program on Influenza, sought to establish standards for the profession. The standards the APHA set in December 1918 guided American vaccine trials for a quarter century.