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Updated: May 29, 2025
The demonstration was successful beyond peradventure that yellow fever could be transmitted by mosquitoes, and equally the negative proposition that it could not be transmitted by fomites. An interval of twelve or more days was found to be necessary after the mosquito has bitten a yellow fever patient before it is capable of transmitting the infection.
Yet he saw fit to question the old assumption that yellow fever was spread by invisible particles called "fomites." Indeed, he had the boldness to disprove it. Then he disproved, also, the assumption that the fever was contagious by contact. After that he set out to test a hypothesis of his own. His attitude toward the results of former investigations was thus skeptically critical.
Thus, during the epidemic of 1793, the contagiousness of the disease was debated. Then the theory of "fomites" arose, and underwent investigation. Finally, the spread of the disease through the mosquito was proposed for the solution.
Recall, for instance, how the cause of yellow fever has been discovered. For years people had attributed the disease to invisible particles which they called "fomites." These were supposed to be given off by the sick, and spread by means of their clothing and other articles used by them. Investigation caused this theory to be abandoned. Then, since Dr.
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