Infectious Disease
circa 1157 BCE — mummy of Pharaoh Ramesses V, ancient Egypt
Smallpox was among the most destructive infectious diseases in recorded human history, responsible for the deaths of hundreds of millions of people across multiple civilizations over thousands of years. Ancient physicians in Asia, Africa, and the Middle East developed early theories about its origins and attempted numerous treatments long before the disease's viral nature was understood. The history of smallpox represents one of medicine's greatest arcs — from superstition and helplessness to the first deliberate immunization efforts and ultimately global eradication.
Historical Narrative
The earliest confirmed evidence of smallpox in human populations comes from ancient Egypt, with pustular skin lesions identified on the mummy of Pharaoh Ramesses V, who died around 1157 BCE. Ancient Egyptian medical texts referenced conditions consistent with the disease, and some historians have proposed that smallpox contributed to the devastating plague that swept the ancient Mediterranean world during the reign of Marcus Aurelius in the second century CE, though this identification has remained a subject of scholarly debate.
In ancient India, physicians described a disease corresponding to smallpox in texts dating to roughly the seventh century CE, and a goddess named Shitala was venerated as both the cause and the potential cure of the affliction. Indian healers developed one of the earliest known methods of deliberate inoculation, a practice called variolation, in which material from smallpox pustules was introduced into the skin of healthy individuals to provoke a milder, protective illness. This practice was also documented independently in China as early as the tenth century CE, where physicians reportedly blew dried smallpox crusts into the nostrils of patients to induce protective immunity.
In the Islamic world, the Persian physician Ibn Sina, known in the West as Avicenna, described smallpox in the eleventh century CE in his Canon of Medicine, differentiating it from measles and offering detailed observations about its course. The influential ninth-century physician Muhammad ibn Zakariya al-Razi, known as Rhazes, produced what many historians consider the first systematic clinical description distinguishing smallpox from measles, a remarkable feat of medical observation in an era without microscopy or germ theory.
Smallpox arrived in the Americas with catastrophic consequences following European contact in the late fifteenth and sixteenth centuries. Indigenous populations, having no prior exposure, suffered mortality rates that devastated entire civilizations. Spanish colonial records documented the destruction wrought by the disease among Aztec and Inca populations, and historians have since recognized smallpox as having played a decisive role in the collapse of pre-Columbian societies.
The practice of variolation was formally introduced to Western Europe and Britain in the early eighteenth century, largely through the advocacy of Lady Mary Wortley Montagu, the wife of the British ambassador to the Ottoman Empire, who had observed the practice in Constantinople and championed it upon her return to England. Variolation was tested on condemned prisoners in 1721 under the observation of the Royal Society and was subsequently adopted, albeit cautiously, among European aristocracy.
The decisive turning point in smallpox history came with the work of English physician Edward Jenner, who in 1796 conducted his now-famous experiment demonstrating that inoculation with cowpox material protected individuals from subsequent smallpox exposure. Jenner's work, which he formalized in his 1798 publication, introduced the concept of vaccination — a term derived from the Latin word for cow — and laid the intellectual and practical foundation for all subsequent vaccine development. Jenner's method gradually replaced variolation over the following decades, and organized vaccination campaigns spread across Europe and eventually the globe through the nineteenth and twentieth centuries.
Key Historical Figures
Historical narrative only — this page describes how Smallpox was understood historically. It is not medical advice and does not describe current diagnosis or treatment. Sourced from verified medical history references (NIH, Encyclopaedia Britannica, and standard medical history texts). See our medical disclaimer.