This essay accompanies a Gilbert Stuart portrait of George Washington reproduced on the journal cover and situates the image within the historical interplay of art, personal biography, and infectious disease. Stuart painted one of his best-known Washington portraits in 1796; that unfinished work later became the template for Washington’s image on the US $1 bill. The essay notes Stuart’s broader portraiture career and references a 1794 likeness by William Joseph Williams that more clearly shows residual pockmarks.
In 1751, while accompanying his half-brother Lawrence to Barbados, the young George Washington contracted smallpox and experienced several weeks of illness, with lingering minor facial scarring. That firsthand encounter with the natural course and consequences of smallpox informed Washington’s later judgments about the disease’s threat to military forces. In March 1776 Washington warned in general orders that the enemy had spread infection through Boston and that only extreme caution could prevent its spread through the army and countryside.
Variolation was introduced in North America in 1721 and promoted by figures such as Cotton Mather. The procedure involved transferring infectious material from smallpox pustules into the skin of an uninfected person. Variolation typically produced a milder illness than naturally acquired smallpox and reduced case-fatality rates, but it carried two important hazards: it could cause severe disease or death in the inoculated individual and could lead to onward transmission to others.
Historical mortality comparisons cited in the essay illustrate variolation’s relative safety versus natural infection. In a Boston epidemic in 1752, natural smallpox mortality was reported as 9% while mortality among those variolated was 1.5%. In a 1760 Charleston epidemic, natural smallpox mortality was reported as 34% versus 2.6% following variolation. By contrast, naturally acquired smallpox typically carried a case-fatality rate in the range of 25%–30% in historical series.
As Commander-in-Chief in 1776, Washington initially forbade routine variolation of troops. His principal concern was operational: soldiers undergoing variolation would be incapacitated for weeks during recovery, reducing immediate military readiness and creating an exploitable weakness. He explicitly remarked that if inoculation were performed generally, the enemy would take advantage of the army’s temporary debilitated condition. Given the fragile position of the Continental forces early in the conflict, this short-term risk to force strength and security informed the prohibition.
Despite earlier reservations, Washington changed course as smallpox continued to threaten troop strength. In February 1777 he ordered systematic inoculation of Continental soldiers. Washington framed the decision as one of necessity: the disease was spreading and, if contracted naturally with its typical virulence, would pose a greater threat to the army than enemy action. He directed that all troops who had not previously had smallpox be inoculated and that recruits be inoculated upon arrival so they could convalesce while being trained and equipped, then enter active service immune and ready for combat.
Correspondence cited by the essay shows Washington communicating this policy to subordinates and civilian leaders and defending the measure despite its acknowledged drawbacks. By the end of 1777, tens of thousands of soldiers had received variolation under the organized program.
Washington’s variolation campaign is presented as both a strategic military innovation and an organized public health intervention. The program demonstrated that centralized authority could implement population-level disease control measures effectively and at scale. Elizabeth Fenn is quoted in the essay as observing that the general had “outflanked his enemy” by choosing universal variolation. The policy’s outcome was to reduce the army’s vulnerability to naturally acquired smallpox and to improve long-term troop readiness.
The essay situates the continental variolation program within the broader history of smallpox prevention by describing Edward Jenner’s 1796 innovation of vaccination using cowpox material. Jenner observed that milkmaids who had contracted cowpox appeared resistant to smallpox; his experimental inoculation with cowpox provided evidence that exposure to a related, less virulent orthopoxvirus could induce protective immunity. Vaccination (cowpox-derived) and equination (horsepox-derived) were safer than variolation and did not propagate onward smallpox infection. The biological rationale is that Cowpox virus and Variola virus are members of the Poxviridae family and the Orthopoxvirus genus, and some orthopoxvirus species elicit cross-immunity against others.
Smallpox represented a central noncombat threat during the American Revolution and arguably posed a greater immediate danger to the Continental Army than British forces. Washington’s decision to pivot from prohibiting routine variolation to implementing a systematic inoculation program combined his personal experience with smallpox, respect for medical intervention, and military necessity. The program established an early precedent for government-led, population-level public health action implemented for strategic and protective reasons. While variolation predates vaccination, its organized use under Washington’s authority had lasting consequences for troop health and military effectiveness.
The essay lists primary correspondence by Washington, historical monographs and commentaries on smallpox and variolation, and acknowledges non-generative use of ChatGPT by the author to locate references. Full bibliographic citations and primary-source links are provided in the original article.