ANIMAL PARASITES OF MAN. 201 



INFECTIONS WITH INTESTINAL PROTOZOA OTHER THAN AMCEBA. 

 (21 per cent.) 



So many atypical forms of flagellates and forms, which could not 

 with certainty be readily placed in known genera, were encountered 

 that the attempt to differentiate all of these organisms was abandoned 

 at an early period and the diagnosis was made under the general term, 

 monads. The flagellate most frequently present was Cercomonas, prob- 

 ably the usual Cercomonas ho minis of other localities. There were three 

 infections with Balantidium and three with Lamblia. 



As in the case of Amoeba, only the observation of the motile forms of 

 these organisms was considered to be a safe basis for a positive diagnosis. 



INFECTIONS WITH STRONGYLOIDES. 

 (3 per cent.) 



The statistics at command for the prevalence of Strong yloides are the 

 following : 



Strong, 1901, Philippine Islands, 2,179 persons examined, 13, or 0.6 per cent, 

 infected; Daniels, 1901, British Central Africa, 251 persons examined, 3, or 

 1.50 per cent, infected; Wellman, 1904, West Africa, 310 examined, 2 or 0.65 

 per cent, infected; Antemia Commission, 1904, Porto Rico, 4,482 examined, 36, 

 or 0.8 per cent, infected; Stiles & Garrison, 1906, United States, 3,457 examined, 

 8, or 0.23 per cent, infected. 



Our figures (132 infections, 3 per cent) are somewhat higher than any 

 hitherto reported. The diagnosis in every case was based upon finding 

 the free embryo in specimens examined not more than four hours after 

 the stool was passed. 



To the best of our knowledge, hookworm ova, even in a tropical climate, 

 never hatch in less than twelve hours after the fasces are passed. 



INFECTION WITH OXYURIS. 

 (0.8 per cent.) 



As has been repeatedly pointed out by various workers, the microscopic 

 examination of fasces for ova is not a reliable method for the diagnosis 

 of the pinworm, for the reason that the migration of the adult female 

 worm to the exterior prevents such a distribution of the ova through the 

 fasces as occurs in the case of ova which are deposited in the intestine. 



The highest rate of infection with pinworms reported from microscopic 

 examination of the feces was that of Dobson, in India, who found 15.37 per 

 cent of 1,249 persons to be infected; the next highest, 10.98 per cent, was 

 reported by Grechaninoff, in St. Petersburg, in 1S90, upon the microscopic 

 examination of the faeces of 583 persons. 



Some statistics based upon findings at autopsy show higher figures. Both 

 Gribbohm and Heller encountered a fraction over 23 per cent of infection with 



