19 



calopus (fig. 16), which abounds in regions where yellow fever is 

 possible. The bite of this mosquito, however, does not convey yellow 

 fever to a healthy person until twelve days have elapsed from the 

 time when the same mosquito has bitten a person suffering with the 

 disease. It follows from this fact that by keeping yellow-fever 

 patients screened from the possibilities of mosquito bites we can 

 prevent the yellow-fever mosquito from becoming infected. It fol- 

 lows further that by preventing healthy people from being bitten 

 by mosquitoes we can keep them free from the disease even where 

 infected mosquitoes 

 exist. And it fol- 

 lows still further 

 that by the adoption 

 of remedial measures 

 looking toward the 

 destruction in all 

 stages of the yellow- 

 fever mosquito we 

 may reduce to a min- 

 imum the possibili- 

 ties of the transfer 

 of the disease. After 

 demonstrating the 

 fact, the medical offi- 

 cers of the Army in 

 Cuba put these meas- 

 ures into effect, and 

 the results were most 

 gratifying. The 

 health of Havana 

 immediately im- 

 proved, and the general health of Cuba and the industrial conditions 

 dependent upon better sanitation have continually gained since. 



The New Orleans outbreak of yellow fever in the summer of 1905 

 was quickly stopped by antimosquito measures, and it is conceded 

 that more than 4,000 lives were saved in that city during that season 

 by the intelligent application of measures based upon the discovery 

 of the United States Army surgeons in Cuba in 1900 and 1901. 



155 



Fig. 16. — Stegomyia calopus. Enlargpd (author's illustra- 

 tion). 



o 



