Observing that malarial fever may occur during any month of the year, in any climate, and in regions where there are no mosquitoes, one is often asked the question: "In the beginning of the year, where does the malarial parasite come from?"
Before the days of the discovery of the fact that the Anopheles acts as the carrier of the malarial parasite, the above question was impossible of solution, and, indeed, some time after that discovery had been made known to the world through the researches of Ronald Ross and others, some observers were slow in being convinced in regard to the true etiology of this disease. Having considered the fact that malarial fever became more prevalent during months of the year when the weather was warmest, and when vegetable and organic matter was most subject to decay, the opinion became current that the cause of malarial fever was generated
WOLDERT A. HOW THE MALARIAL PARASITE PERPETUATES ITS EXISTENCE.. JAMA. 1908;L(16):1247–1249. doi:10.1001/jama.1908.25310420015001f
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