THE EFFECT OF COLD UPON MALARIA PARASITES IN THE MOSQUITO HOST.
The experiments reported here have shown that the parasite of tertian malaria in the mosquito host is able to survive exposure to a temperature of 30 degrees F. for a period of 2 days, 31 degrees F. for 4 days, and a mean temperature of 46 degrees F. for 17 days. In a smaller series of tests the sporonts of the estivo-autumnal parasite have shown a resistance to temperatures as low as 35 degrees F. for 24 hours.
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Bureau of Entomology, U. S. Department of Agriculture, Washington, D. C., and the Laboratories of Clinical Medicine of the School of Medicine of Tulane University, New Orleans.