JAMA. 1903;XLI(1):39-40. doi:10.1001/jama.1903.04470030043017.
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An interesting example of the mosquito origin of malaria is furnished by a house endemic reported by Jancsó.1 It seems to explain how fresh cases may occasionally spring up in winter, aside from the well-recognized relapses. In November and December, with ice and snow on the ground, there occurred in the hospital, both among the patients and the staff of assistants, nine cases of malaria, recognized as such by the clinical behavior and by the detection in the blood of the parasites, in every case those of the estivo-autumnal variety. The explanation of this occurrence, unusual for the time and place, was found in the fact that a few days before the cage containing several specimens of anopheles that had been experimentally infected with this variety of plasmodium was overturned accidentally, the mosquitoes escaping, but not, as was thought at first, being destroyed by the cold. As was later


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