VIII, B, 3 Cro2vell and Hammack: Intestinal Parasites 



159 



is always smaller and weaker than its host, does not attempt to endanger 

 the life of the latter, as simultaneously its own existence would be threat- 

 ened. The parasite, of course, robs its host, but usually in a scanty and 

 sparing manner, and the injuries it inflicts can hardly be taken into account. 

 There are, however, numerous cases in which the situation of the parasites 

 or the nature of their food, added to their number and movements, may 

 cause more or less injury, and even threaten the life of the host. 



For purposes of easy comparison, the tables compiled and 

 published by Willets, (6) bearing on the parasites found by 

 clinical examination of faeces, are inserted. 



Table I. — Summary of findings. (^) 



Examinations and infections. 



Number. 



Per cent. 



Persons examined 



4,278 

 3,656 



2,653 



2,326 



342 



64 



59 



5 



.4 



1 







85.46 



62.04 

 54.37 

 7.99 

 1.50 

 1.38 

 0.12 

 0.09 

 0.02 



Persons infected with — 





Trichuris 



OxyuTis -- - 



Taenia 



HyTneTwlcpis 



StT<yn(jyloidcs 





Total infections - 



5,454 



127.49 





" Probably Fascioletta ilocana Garrison, 1908. 



Table II. — Percentages of persons infected and total infections in various 



parts of Luzon. {^) 



Authority and date. 



Place. 



Sex. 



Exam- 

 ined. 



Infect- 

 ed. 



Per 



cent. 



Total 

 infec- 

 tions. l> 



Per 

 cent. 



Garrison, 1908 (1) 



Manila 



Mostly males _. 



4,106 



»3,447 



84.00 



5 812 



142 00 





do - 





385 



b342 



89 00 



533 



138 70 



mas, 1909(2). 





children. 













Garrison, Ley nes. 



Taytay, Rizal 



Males and fe- 



1.000 



■>959 



95.90 



1,726 



172. 60 



and Llamas, 





males. 













1909(3). 

















Rissler and Go- 



Las Pinas, Rizal 



do 



6,018 



»5,406 



89 83 



8,996 



149 48 



mez, 1910 (4). 

















Do 



Tuguegarao, Ca- 



do 



2,594 



a 1, 932 



74.13 



2,887 



111 30 





gayan. 















Do 



Santa Isabel, Ila- 

 gan, Isabela. 



do 



802 



«692 



86.28 



927 



114.34 







Chamberlain, 



Baguio, Benguet . 



Adult males 



119 



bllO 



92.50 



209 



174.00 



Bloom bergh. 

















and Kilbourne 

















1911(5). 

















Willets, 1911(6).. 



San Antonio and 

 Maluno, Ilagan, 



Males and fe- 

 males. 



4,278 



b3,656 



85.46 



5.454 



127.49 



Total 



Isabela. 















19,302 



16, 535 



85.66 



26,544 



137. 52 









' Protozoan findings included. 



■> Intestinal worms only. 



