1) The intestinal blood loss from Necator americanus infection was determined by the 51Cr-red cell labelling method in 20 patients. 2) The daily blood loss varied from about 2 ml. to 90 ml. and was proportional to the worm load, but did not appear to be related to the haemoglobin level.
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P. W. G. Tasker (1961) studied this question.
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