﻿184 



The Philippine Journal of Science 



1914 



Table XI. — Relation of splenic enlargement to the presence of malarial 

 parasites in the blood in persons grouped according to age. 



Age. 



1 to 10 years . 

 11 to 20 years _ 

 21 to 30 years _ 

 31 to 40 years . 

 41 to 50 years . 

 51 to 60 years _ 

 61 to 70 years . 

 71 to 80 years . 

 Age unknown.. 



Parasites. 





Spleen. 





Percent- 

 age of 

 agree- 

 ment. 



Infec- 

 tion. 



Cases. 



Much 

 en- 

 larged. 



Palpa- 

 ble. 



Not en- 

 larged. 







Cases. 



Cases. 



Cases. 





+ 



11 



7 1 



3 



72.70 



1 



16 



3 



2 



11 



68.75 



+ 

 



163 



40 



17 



106 



34.96 



275 



46 



18 



211 



76.72 



+ 



113 



17* 



18 



78 



30.97 







254 



35 



23 



196 



77.16 



+ 



21 



2 



2 



17 



19.04 







82 



9 



7 



66 



70.48 



J + 



1^ 

 29 







12 



24 









3 



2 



82.76 



f + 



5 

 11 







5 

 9 





1 



2 





81.81 



+ 





 2 

 



















2 



100.00 



+ 











1 







1 





100.00 



+ 







4 





1 



3 



25.00 



4 







4 



100.00 









From Table XI it appears that the percentage of agreement 

 between parasite rate and spleen rate in those persons who 

 showed malarial parasites in the blood is greatest between the 

 ages of 1 and 10 years and constantly decreases in the older 

 age groups; while, on the other hand, the percentage of agree- 

 ment in those persons who were negative for malarial parasites 

 is lowest in the age group of from 1 to 10 years and progressively 

 increases in the older age groups. Nevertheless, the percentage 

 of total agreement between the spleen rate and the parasite rate 

 is greater in children than in adults. 



Therefore, the results of this comparison of the spleen index 

 and microscopic examination of the blood for malarial parasites 

 indicate that, under the conditions of this investigation, the 

 microscopic examination of the blood is the more reliable method 

 of determining the incidence of infection, first, because more 

 cases were discovered by this method; and, secondly, because 

 the microscopic diagnoses of the positive cases are unequivocal. 

 These conclusions are applied only to the determination of the 

 incidence of malarial infection at San Jose and not to the endemic 

 index. 



