Although a long time has elapsed since the last known outbreak of yellow fever on the west coast of South America, there may be some interest in an analysis of the statistics covering a portion of the epidemic.
The data forming the basis of this study by no means cover the total number of cases, but represent that portion concerning which the information was sufficiently complete to include in a “Memoria” which was prepared and presented to the writer as a souvenir of one of the tensest campaigns of the kind on the west coast of South America.
The portion of the epidemic concerned in this paper is that occurring during the months of January to July, in the year 1921. The fever spread to all the principal towns in the Departments of Lambayeque and Libertad. At times it seemed that there was danger of its spread down the coast to Callao, Lima and on towards Chile.