STATISTICAL STUDY OF UNCINARIASIS. 253 



the period from January 21, 1907, to January 25, 1910, there were found . 

 only 19 cases of uncinariasis;, the admissions for the same period having 

 numbered 11,544 persons, and the number of stool examinations (omitting 

 repeated examinations) approximately S00. The percentage of patients 

 found to be infected is, therefore, less than 0.2 per cent, this being 

 about one-fifth of the rate at the Division Hospital. The percentage 

 of stools showing ova of uncinaria was 0.9 per cent at the Division 

 Hospital and 2.4 per cent at Port William McKinley. (See Table II.) 



The stools of 326 white patients were examined at the Civil Hospital 

 in Manila, during the last half of 1909, and 16 cases of uncinariasis 

 discovered, an infection rate of 4.8 per cent, which is very much higher 

 than was found at the two hospitals referred to above. This hospital 

 treats all classes of civilian employees who, on the average, probably take 

 less care as regards shoes, food, and water than do the inmates of the 

 military hospitals. The figures for the Civil Hospital were furnished 

 by Doctor Ohno, of the Biological laboratory, Bureau of Science, Manila, 

 P.I. 



Of the 90 cases at the Division Hospital and at Port William Mc- 

 Kinley, only 11 (4 at the Division Hospital and 7 at Port William 

 McKinley) were admitted because of uncinariasis, the remainder of the 

 cases having entered the hospital for other reasons, the ova being demon- 

 strated upon the examination of the stools. 4 Therefore we are justified 

 in consideiing that uncinariasis, sufficiently marked to be detected 

 either clinically or by the routine stool examination, is rare among 

 Americans in and about Manila. 



Probably, if an exhaustive examination was made of the stools, with 

 uncinariasis alone in view, a somewhat larger percentage of infection 

 would be found than is shown above. By an exhaustive examination is 

 meant the complete search, if necessary, of 8 or 10 cover-glass preparations 

 from each patient, or the employment of the specific gravity method 

 described by Bass (16) (17). My own experience in Louisiana showed 

 that in 28 per cent of the infections 2 or more cover-glass preparations 

 had to be gone over to demonstrate the ova and sometimes 6 or 8 were 

 examined before the first egg was discovered. As far as is known, the 

 only work of this kind, on a large scale, which has been done in the 

 Islands, was the examination of the Eighth Infantry at Camp Jossman, 

 Guimaras, by Lieutenants Pinkston and Mclntire, under the direction of 

 Major Glennan (19). They examined 528 men and found 9 per cent 

 infected with hookworms. 



*Of the 76 cases of uncinariasis among officers and soldiers found by Cole 

 at the Division Hospital from its organization in 1898 up to August, 1907, 

 one-half (38) were admitted for uncinariasis, and the histories of these 38 .show 

 gastro-intestinal disturbance in 32, of whom 21 had dysentery, 5 diarrhoea, and 

 1 sprue. Of the 38 men admitted for other conditions, in whose stools ova of 

 uncinaria were found, all had gastro-intestinal symptoms (10). 



