﻿IX, B, 1 



Willets: Intestinal Parasitism 



85 



active entamoebae among 1,000 inhabitants of Taytay, Rizal 

 Province. Rissler and Gomez,* 1910, report 0.39 per cent posi- 

 tive for entamoebae of 6,018 persons examined at Las Pinas, 

 Rizal Province, for evidence of intestinal parasitism, particularly 

 hookworm infection. In similar investigations the same men 

 found not a single entamoebic infection among 2,549 persons 

 examined at Tuguegarao, Cagayan Province, and 802 examined 

 at Santa Isabel, Ilagan, Isabela Province. Stitt,^" 1911, exam- 

 ined 100 Filipinos of the outdoor clinic of the Naval Hospital, 

 Canacao, Cavite Province, for entamoebae, finding 9 per cent 

 positive. 



In the consideration of these investigations it is important to 

 note several factors. In some of them fresh liquid stools ob- 

 tained by the administration of a saline cathartic were examined, 

 whereas in others fresh or old normal stools were used. The 

 number of specimens examined of each case was not mentioned 

 in a single instance. The number of cover-glass preparations 

 examined of each specimen was usually not stated. The kind 

 of infections sought varied considerably. Also, the stage of 

 development required for a diagnosis was not given in some 

 instances, and in no case were active, quiescent, or encysted 

 forms recognized. 



The data are given more concisely in Table III. 



Table III. — Percentage of entamcebic infections and the conditions under 

 which they were obtained by various authorities. 



Authority and date. 



Strong, 1901 -_ - - 



Vedder, 1906. .-- - - 



Ashburn aad Craig, 1907 



Hoyt. 1908 - 



Garrison, 1908 



Garrison, Leynes, and Llamas, 1909 



Rissler and Gomez, 1910 



Stitt, 1911 



Exam- 

 ined. 



Infected. 



200 



50 



50 



107 



283 



17 



4,106 



1,000 



6.018 



2,594 



802 



100 ! 



Per cent. 



4.00 



70.00 



50.00 



71.00 



32.00 



76.00 



23.00 



2.70 



0.89 



9.00 



Place. 



Manila. 



Cotabato Valley, Mindanao. 



Do. 

 Manila. 

 Cafiacao, Cavite. 



Do. 

 Manila. 

 Taytay, Rizal. 

 Las Pifias, Rizal. 

 Tiiguegarao, Carayan. 

 Santa Isabel, Ilagan, Isabela. 

 Cafiacao, Cavite. 



Ibid (1910), 5, 267. 



"Ibid (1911), 6, 211. 



