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The study of natural immunity and susceptibility of mosquitoes to malaria, as well as of the other arthropods to the parasites which they transmit is of great importance. Susceptibility to a given parasite in one species of arthropod may be the absolute determining factor in making this species a highly efficient vector. On the other hand other species of arthropods may possess a natural immunity to the parasite and will therefore take no part in its transmission although, except for this natural immunity, they may appear to be equally well adapted to serve as vectors. Our malaria problems would have been much simplifiedand I probably should not be talking to you todayif it had been shown that the transmission of malaria was sharply restricted to a few species of mosquitoes. Unfortunately it has been found that susceptibility to malaria parasites is not strictly correlated with any species, variety, or race of mosquitoes.
Received November 12, 1934.
1 Read at a meeting of the American Society of Tropical Medicine, and the National Malaria Committee, San Antonio, Texas, November 15th, 1934.
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