A STATISTICAL STUDY OF INTESTINAL PARASITES 



IN TOBACCO HACIENDAS OF THE CAGAYAN 



VALLEY, PHILIPPINE ISLANDS.* 



By David G. Willets. 

 (From the Biological Laboratory, Bureau of Science, Manila, P. I.) 



Table I. — Summary of findings. 



Examinations and infections. 



. Number. 



Persons examined 



Persons infected 



Persons infected with 



Ascaris 



Hookworm 



TrichuHs 



Oxyuris 



Tsenia 



Hymenolepis 



Strongyloiden 



Trematodes" 



Total infections 



•5, 4.54 



Percent. 



4,278 

 3,656 





85.46 



2,653 



62.04 



2,326 



54. 37 



342 



7.99 



64 



1.50 



59 



1.38 



5 



0.12 



4 



0.09 



1 



0.02 



127. 49 



" Probably Fascioletta ilocana Garrison, 1908. 



Upon the completion of the medical survey of the town of Taytay/ 

 Eizal Province, in 1909, which was an effort to determine the health 

 conditions in a representative Filipino community and which included 

 the examination of the faeces of 1,000 persons, the Bureau of Health 

 inaugurated a campaign to determine the frequency and medical im- 

 portance of intestinal parasitism in other parts of the Island of Luzon 

 with particular reference to the incidence and significance of hookworm 

 infections. During the surs'ey, 6,018 persons were examined at Las 

 Pinas, Eizal Province ; 2,594 at Tuguegarao, Cagayan Province ; 802 at 

 Santa Isabel, 3,310 at San Antonio, and 968 at Maluno, barrios of 

 Ilagan, Isabela Province. The results obtained at the first three places 

 have already been reported.^ The present paper contains the findings 

 at the last two places named. 



* Read at a meeting of the Manila Medical Society, January 9, 1911. 



^This Journal, Sec. B (1909), 4, 207. 



^Eissler and Gomez, This Journal, Sec. B (1910), 5, 267. 



77 



