﻿IX, B. 2 



Sanitary Survey in Mindoro 



175 



this report, the barrio of Mangarin shows a "spleen index" among 

 children of 98 per cent, and it is altogether probable that 100 

 per cent of the population of this place is infected with malaria. 

 The inhabitants of San Jose, including the officials and em- 

 ployees of the Mindoro companies, are made up of a transient 

 population recruited from all parts of the Philippine Archi- 

 pelago. The incidence of malaria among these people is exceed- 

 ingly high, and the morbidity factor is a most important one. 

 In the examination of 1,110 employees and other inhabitants of 

 this estate, positive enlargement of the spleen was found to be 

 present in 26.21 per cent. 



Examination of blood from 1,095 of these employees showed 

 malarial parasites in 373, or 34.6 per cent. For a consideration 

 of the relative importance of the "spleen index" and examination 

 of blood smears in the diagnosis of malaria, see the special report 

 by Doctors Walker and Cox, page 181. 



The relation of the "spleen index" to ages of patients is 

 shown in Table VII. 



Table VII. — Relation of spleen index to age. 



Afire. 



Cases 

 exam- 

 ined. 



Spleen. 



Palpable. 



Number. Percent, 



Markedly enlarered. 



Number. Percent. 



I to 5 years.. 

 6 to 10 years - 



II to 20 years 

 21 to 30 years 

 81 to 40 years 

 41 to 50 years 

 51 to 60 years 

 81 to 70 years 

 71 to 80 years 



21 



10 



494 



393 



119 



48 



14 



2 



1 



3 



2 



62 



53 



13 



3 











1 



14.80 

 20.00 

 12.50 

 13.50 

 10.90 



6.25 









 100 



4 

 5 

 88 

 41 

 8 

 4 

 1 

 

 



19.00 



50.00 



17.80 



11.19 



6.70 



8.33 



7.14 











It is, of course, probable that a certain small percentage of the 

 enlarged spleens are due to causes other than malaria, but even 

 eliminating these we still have a malaria incidence that is so 

 high as to require radical measures for its reduction. In look- 

 ing into the causes of these conditions, we have three important 

 sources of infection; first, outside sources. A study of the 

 records of people examined shows that they come from all pro- 

 vinces of the Philippine Islands, and the incidence of spleen 

 enlargement, by districts and countries, is shown in Table VIII. 



