262 GARRISON, LKYXES, AND l.l.A.MAS. 



Witli regard to tlie prevalence of woj'jus in the various ago groups, 

 (Tables 3, 4, 5) little difference is noted in the total proportion infected 

 and the average number of infections, excepting that the figures are 

 lower for those less than 2 years old (nursing children). Still, over 

 60 per cent of these were infected and they averaged neai-ly ninety 

 infections to a hundred. Here again the rate of infection with the 

 individual parasites varies considerably in the different groups. 



ASCABIS INFECTIONS. 



82.9 per cent. 



Eoundworms were the parasities most frequently encountered, and 

 they were much more prevalent in the Taytay population than among 

 either the Bilibid prisoners (26 per cent) or the Manila women and 

 children (53 per cent). They were somewhat more common among 

 females (85.8 per cent) than among males (79.9 per cent), and among 

 children between 2 and 14 years of age than in other ages. Female 

 children between 2 and 14 years gave over 91 per cent of Ascaris 

 infections. 



Among older age groups Ascaris and TricJi/uris are about equally 

 pi'evalent. 



TRICHURIS. 



In the results at Bilibid and for the women and children in Manila 

 whipworms were the most prevalent of intestinal parasites (59 and 86 

 per cent respectively.) At Taytay, Triclmris was found in 77 per cent 

 of the people, being second in frequency to Ascaris alone ; and these two 

 worms together gave 1599 oP the total 1726 infections with intestinal 

 worms. 



The whipworm infections at Taytay were very evenly distributed 

 proportionately in the two sexes and among the various age groups (see 

 Tables 2 to 5), only the children under 2 years of age showing any 

 marked difference from other groups. 



HOOKWORM INFKCTIONS. 



Only 116 infections with hookworms were found among the 1,000 

 persons examined at Taytay, an average of only 11.6 per cent, and this 

 has occasioned considerable surprise. An infection of 60 per cent has 

 been reported from Philippine Scouts, 50 per cent from Bilibid prisoners, 

 and Stiles and Garrison reported 10 per cent in American soldiers two 

 years after they had left the Philippines. 



It must be noted that all the figures are based upon the examination 

 of adult males, and when the results at Taytay are considered for different 

 sexes and ages (see Tables 4, 5, 6) the disparity is not so remarkable, 

 tlmugh still great. 



All males examined at 'J'aytay gave 17.2 per cent infected with 



