STUDY OF INTESTINAL PARASITES. 89 



Table XI. — Hookworm findings in men and women in selected cabecerias. 



Number 



of cabe- 



ceria. 



Group A. Located on rocky soil. 



Men. 



Women. 



Exam- 

 ined. 



Positive. 



Per cent. 



Exam- 

 ined. 



Positive. 



Per cent. 



2 

 18 

 26 



4 



13 

 14 



37 



9 



26 



15 

 13 



40.54 

 47.37 

 50.00 



42 

 19 

 25 



12 

 4 



8 



28.57 

 2L05 

 32.00 



Group B. Located on lowlands. 



25 

 26 

 40 



24 

 20 

 37 



96.00 

 76.92 

 92.50 



29 

 25 

 28 



18 

 14 

 23 



62.07 

 56.00 

 82.14 



The geographical distribution of infections with Trichuris was in- 

 fluenced by the 58 Visayans, 63.79 per cent of whom were infected with 

 this parasite, and association with people in Ilagan Central. The 

 Visayans had been at the hacienda about one year and undoubtedly 

 carried the. parasites into the valley with them. The whipworm was 

 found more frequently among the persons living in cabecerias near them, 

 than among those in other parts of the hacienda. The people who lived 

 nearer Ilagan Central were more frequently infected with this parasite 

 than those farther away, excepting the Visayans and their neighbors. 

 The infections probably took place while the individuals were visiting 

 in the town. These opinions are supported by the fact that Maluno, 

 which has no Visayans and which is located at quite a distance from 

 Ilagan Central, so that visiting is inconvenient, had fewer with Trichuris 

 than had San Antonio. 



The majority of the infections with Tcenia occurred in cabecerias 

 which are located near the mountains where it is the custom to hunt 

 occasionally. During these hunting trips raw pork or deer meat is some- 

 times eaten. 



MEDICAL SIGNIFICANCE. 



While the investigation had, as one of its objects, the determination of 

 the medical significance of the infections found, particularly those with 

 the hookworm, its chief aim was to obtain statistics relative to the 

 incidence of the various parasites. The great majority of cases were seen 

 only once so that it was impracticable to study them clinically. Nothing 

 can be said definitely regarding the influence of intestinal parasites at the 



