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The barrier of time and space between the United States and the tropics of South and Middle America disappears in proportion to the use of the airplane for passenger travel. It is quite possible for persons to leave the areas of infectious tropical diseases and enter the United States well within the incubation period of several dangerous diseases, such as yellow fever. Even transportation by ship affords some opportunities for the entry of the infectious diseases of middle and southern America, notwithstanding the highly efficient work of the United States Public Health Service at ports of entry. Thus the diseases of the tropics constitute a threat to the health of the people of the United States. This well prepared publication is one of a long series produced under the auspices of the Carnegie Institution of Washington. It is based in part on first hand observations in Guatemala and in part
A Medical Survey of the Republic of Guatemala. JAMA. 1939;113(1):85. doi:10.1001/jama.1939.02800260087033
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