Anticipated Progress of Yellow Fever in Guatemala and Mexico, 1955-1959

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Abstract
The continuous northward progress of jungle yellow fever through Central America since its origin as a wave from eastern Panama in November 1948 suggests that involvement of northern Guatemala may be anticipated in July or August 1955 and that the wave will move onward with a velocity of approximately 160 miles / year into Mexico, its main axis advancing toward Tampico. Urbanization of the virus to the Gulf cities of Mexico and the United States will become a distinct threat early in 1957. The historic implications of the possible impact of similar waves on the Aztec and Maya civilization of pre-Columbian times may now be subject to renewed consideration. Although the contemporary wave may conceivably die out at any time, it is considered unlikely that such an event may have taken place.

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