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Dr. Patrick Manson recently delivered an address before the Epidemiological Society of London, in which, according to the British Medical Journal, he said that one of the problems of epidemiology still unsolved is why malaria is present in one country and absent in another, though the climatic conditions in both are the same. Also why the same applies as regards filariasis. He suggested as an explanation that the presence or absence of any malarial disease or filariasis in any particular locality depends on the presence or absence of their respective subserving mosquitoes in sufficient numbers, the presence of the respective mosquitoes being determined not so much by the presence or absence of the essentials for mosquito life, viz., water, adequate atmospheric temperature, and vegetable food, as by the presence or absence of special conditions inimical to special kinds of mosquitoes. Manson suggested a plan for the investigation of this subject
MALARIA INVESTIGATION IN THE PACIFIC ISLANDS.. JAMA. 1901;XXXVI(14):971. doi:10.1001/jama.1901.02470140041006
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