. The American journal of tropical medicine. 2 138 0 126 2 119 0 163 0 296 6 350 6 265 4 143 25 2154 CRESCENTS 28724192015202433502822 290 was examined as far as practicable. The blood examination wasmade or verified personally by the writer in all but about 5 percent of cases. Thin smears were used in all routine work. Table 1 shows the monthly distribution of the various typesof malaria. Crescents are included under estivo-autumnalbut are also listed separately to show the relative frequency offresh infections and carriers of the estivo-autumnal type ofmalaria during the year. Figur
. The American journal of tropical medicine. 2 138 0 126 2 119 0 163 0 296 6 350 6 265 4 143 25 2154 CRESCENTS 28724192015202433502822 290 was examined as far as practicable. The blood examination wasmade or verified personally by the writer in all but about 5 percent of cases. Thin smears were used in all routine work. Table 1 shows the monthly distribution of the various typesof malaria. Crescents are included under estivo-autumnalbut are also listed separately to show the relative frequency offresh infections and carriers of the estivo-autumnal type ofmalaria during the year. Figure 1 is a graphic representation of the chief points in table1. September and October are the end of a prolonged dry MALARIA IN EASTERN CUBA 38J season. jMost of the anopheles breeding places were dry andfresh infections accordingly few. November and Decemberwere wet with an abundance of anopheles breeding places through-out cane field and bush. The result was numerous heavy freshinfections. Several factors account for the marked drop during. Fig. 1 January, February, and ;March. The temperature was suffi-ciently low to retard mosquito development somewhat. Severalthousand new and relatively malaria free laborers came to theplantation from Hayti. The proportion of pneumonia andother respiratory diseases was high, and quinine prophylaxis 384 N. NEDERGAARD was effectively carried out in certain sections. During April,May, and June conditions were very favorable for anophelesbreeding, and there was an increasing tendency on the part ofthe laborers to avoid the bi-weekly dose of quinine. The resultwas a marked increase in new infections especially among theHaytian cane cutters. In table 2 the Haytians, Jamaicans, and Cubans have beengrouped separately. This brings out an interesting point in TABLE 2 October November ..January, 1921 February March April May June July August Total Per HAYTIAN Num-ber ex-amined Tertian Estivo- autum- nal 126 17 28 59 2 12
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttropica, bookyear1921
