A Rat's Progress: Plague and the "Migratory Rat" in British India, 1896-1899

Whether referring to oceanic travel on board of ships or to movement in terra firma, framings of the "migratory rat" formed a key epidemiological component of approaches to the Third Plague Pandemic (1894-1959) as the first pandemic to be understood as caused by a zoonotic disease. In this article, I examine the emergence and development of scientific framings of the migratory rat in the first, explosive years of the third plague pandemic in India (1896-1899). Examining publications and archival sources, I ask how this animal figure came to inform and transform epidemiological reasoning. Going beyond established approaches that have shown how the rat-plague relation was mobilised by colonial doctors to pathologise Indigenous lifeways, I argue that more complex and ambivalent processes were also set in motion by this figure. First, I show how the migratory rat became invested with attributes of invasiveness that assumed ontological qualities in colonial epidemiological reasoning. Second, comparing the migratory rat with the hitherto established "staggering rat," I argue that the former embodied new approaches to both space and time in epidemiology. Third, I show how Indigenous scientists came to mobilise this complex figure to contest colonial approaches to plague.