The protozoan parasite Giardia lamblia, although frequently found in the stools and duodenal contents of children, has not been clearly demonstrated to be pathogenic for man. The varied and vague clinical symptoms associated with the presence of the parasites in the
UNITS VIT. A 100 CC. PLASMA 150 100 50 4 8 HOURS AFTER VITAMIN A
Chart 1.—Poor absorption of vitamin A by patients infected with Giardia lamblia before treatment with quinacrine hydrochloride. The normal absorption curve for vitamin A is represented by the broken line and curves obtained for the patients by solid lines. upper part of the small intestine in children have been adequately described by Véghelyi1 and by Maris and Bushong.2 The prompt and usually complete disappearance of the symptoms after successful expulsion of the parasite, particularly by the oral use of quinacrine hydrochloride,2 as reported in recent years, is considered evidence in favor,