The endemic diseases of the southern states . e knee-chest position. In the cases where this has failed me I haveusually had success on obtaining a fresh supply of salt water used in the same manner is often the anal pruritus weak mercurial ointment or zinc oxideointment should be applied locally at night. Reinfection shouldbe guarded against and the treatment persisted in until thecure is radical. OTHER INTESTINAL PARASITES 521 TRICHURIS TRICHIURA. Trichocephalus dispar, Trichocephalus trichuris, Trichocephalus hominis,Ascaris trichiura, Whip-worm The whip-worm is
The endemic diseases of the southern states . e knee-chest position. In the cases where this has failed me I haveusually had success on obtaining a fresh supply of salt water used in the same manner is often the anal pruritus weak mercurial ointment or zinc oxideointment should be applied locally at night. Reinfection shouldbe guarded against and the treatment persisted in until thecure is radical. OTHER INTESTINAL PARASITES 521 TRICHURIS TRICHIURA. Trichocephalus dispar, Trichocephalus trichuris, Trichocephalus hominis,Ascaris trichiura, Whip-worm The whip-worm is said to be cosmopolitan. It ranks thirdin frequency among the infections found by the RockefellerSanitary Commission. I failed to find ova of this parasite inabout 500 examinations in the Mississippi River bottomin eastern Arkansas. Infections are commoner among negroes than among whites. The frequency of this parasite is sometimes regarded as anindex to the sanitary condition of a community. Females are more frequently infested than Fig. 115.—Ovum of trichuris trichiura, enlarged. Infections have been found from the age of less than threemonths until old age. Stiles and Garrison- collected fromthe literature a number of cases, which fall according to age inthe following limits: 0-15 years 4°° iS-3° years 41 30-50 years 66 More than 50 years 16 Besides in man the whip-worm is found in certain monkeysand lemurs. No intermediate host is necessary in the propagation ofinfection, the partially developed ova being swallowed withcontaminated water or food. The whip-worm has a thick club-shaped body which tapersradially into the long thread-like neck. The male is 40—45 52 2 ENDEMIC DISEASES OF THE SOUTHERN STATES mm. in length, the female 45-50 mm., about three-fifths beingcomprised by the anterior portion of the body. The anus isterminal and the vulva is situated near the commencement ofthe posterior portion of the body. This part of the body inthe male is spirally ro
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