208 



MOSQUITO ERADICATION 



As a result of the screening demonstration carried on by the 

 U. S. Public Health Service and the International Health Board 

 near Lake Village, Ark., already referred to, it was found that the 

 incidence of malaria, as revealed by blood examination, was 

 reduced from 11.97 to 3.52 per cent for the screened group, but 

 remained virtually unchanged for the unscreened group. Study 

 of the cost of screening for the screened group and of the losses 

 arising from malaria for both groups gives the interesting results 

 shown in the following table: 



It is apparent from this that screening much more than paid 

 for itself, and this on the assumption that it would last only 2 

 years. 1 In addition, there is to be considered the freedom 

 enjoyed by the screened group from annoyance by mosquitoes 

 and also from the fly pest and its accompanying dangers of 

 typhoid. 



1 "Malaria Control: A Report of Demonstration Studies," U. S. Public 

 Health Service, 1917. 



