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This is another disease of the tropics often occurring in widespread epidemics. It is probably most frequently met with in the West Indies, but may occur in any of the tropical countries or islands. Occasionally it spreads into subtropical or even temperate regions. Several extensive epidemics have occurred in the United States.
Recent observations, however, have shown that it is probably caused by a certain Protozoan parasite that is found in the blood of dengue patients and several experiments have been conducted by Dr. Graham which seem to indicate that it is transmitted by mosquitoes. In these experiments, Culex fatigans, a common tropical or subtropical mosquito, was used.
The possibilities of this region, when properly drained and cleared of its superfluous vegetation, are almost beyond computation. It has a rich soil, abundant moisture, and almost tropical climate. Reclaimed land of this character is suitable for raising not only sugar cane and subtropical fruits, but a great variety of other crops.
The prospect was far from displeasing to Perk he felt positive that it would be the first time on record when one of Uncle Sam's Secret Service men fought it out with a taxiing seaplane on the subtropical waters of the great gulf.
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