Stabilising Lymph: British East and Central Africa, ‘Tropical’ Climates, and the Search for Effective Smallpox Vaccine Lymph, 1890s–1903

At the end of the nineteenth century, British imperial doctors found that the glycerinated lymph they received from British-based pharmaceutical companies became inert, failing to protect colonial populations against smallpox. Colonial doctors and their British suppliers thus took a fresh look at the preservation media used for lymph as they discovered how different kinds of lymph reacted to ‘tropical’ climates. British lymph distributors like the Society of Apothecaries sought to maintain their economic hold and influence on the colonies, which provided them with significant commercial outlets to sell lymph, through exploring new modes of preserving lymph. Colonial doctors, however, used the issue to argue for the ability to locally produce vaccine, creating a more economical and dependable production line for the colonies. Building on scholarship on imperial climates, public health, and pharmaceutical manufacturing, I argue that together, colonial climates and local preferences forced calf vaccine lymph producers and users in Britain to redefine their ideas about what constituted smallpox vaccination. These issues affected where colonial lymph was produced and who benefited from lymph’s economic power and scientific authority across international borders, exposing how the tropical colonial climate shifted how long-standing medical technologies were produced and distributed across international borders.