In recent years while our communications with the tropical regions to the south of us were still confined almost entirely to travel by ship the danger of importation of tropical diseases, while considerable, as early experience with yellow fever indicated, has proved controllable through the vigilance of the Public Health Service at the ports of entry. The time factor involved in travel by sea is of material aid in that control in that during the voyage disease usually passes from the stage of incubation to that of manifest symptoms and is more readily detectable upon arrival at quarantine. Moreover the
AIR TRAFFIC AND DISEASE. Ann Intern Med. ;7:1329–1330. doi: 10.7326/0003-4819-7-10-1329
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Published: Ann Intern Med. 1934;7(10):1329-1330.
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