The Balmis Expedition, initiated in 1803, was a significant public health initiative that transported smallpox vaccine across the Spanish Empire to the Americas and Asia. Led by Francisco Javier de Balmis, this expedition was one of the first large-scale international vaccination campaigns, aiming to combat the devastating effects of smallpox. The successful dissemination of the vaccine not only saved countless lives but also marked a pivotal moment in the history of vaccination and public health.

The Balmis Expedition of 1803, which carried the smallpox vaccine across the Spanish Empire, intertwined themes of empire, childhood, and humanitarianism. This historical moment provided later writers with a poignant example of scientific hope traveling through colonial routes, influencing poetry that addressed themes of health and humanity.