Abstract
INCIDENCE It is now generally agreed thatLambliainfection of the intestinal tract is not as rare as it was thought to be before the World War. Surveys in America and in Europe indicate that lambliasis is possibly the second most common of the protozoal infections, being surpassed in frequency only by endamebiasis (Hegner and Payne;1Fantham and Porter;2Kofoid, kornhauser and Plate3). In children, at least in those in institutions, the infection is even still more common than in adults (Maxcy4). DIAGNOSIS Until recently the diagnosis ofLambliainfection could be made only by an examination of the stools. With the increased employment of the intestinal (duodenal) tube, the diagnosis can also be established simply by direct microscopy of the aspirated duodenal contents. Since the active, flagellate form of the parasite is found in the duodenum, it is not necessary to employ the differential staining methods required to identify

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