On the 50th anniversary of her death, Cuba issued a postage stamp honoring Clara Maass's sacrifice in yellow fever research.
On August 24, 1951, the fiftieth anniversary of Clara Maass's death, the government of Cuba issued a commemorative postage stamp in her honor. This tribute reflected the profound and lasting gratitude felt in Cuba, where Maass's sacrifice had directly contributed to the conquest of yellow fever, a disease that had long plagued the island and hampered its development, commerce, and public health.
The stamp stands as a rare instance of a foreign government formally memorializing an American civilian nurse, underscoring how international and collaborative the fight against yellow fever had been — involving American military physicians like Walter Reed and William Gorgas, Cuban physician Carlos Finlay's pioneering mosquito-vector hypothesis, and volunteer subjects like Maass herself.
By the time of this commemoration in 1951, yellow fever had been brought under control in Cuba and much of the Western Hemisphere through sustained mosquito-eradication campaigns, campaigns whose scientific justification rested significantly on the data gathered from experiments like those Maass participated in.
This philatelic honor helped preserve Maass's memory internationally, decades before she would receive similar recognition in the United States. It represents an important marker of her enduring legacy as a symbol of transnational scientific cooperation and personal sacrifice in the history of public health.