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Of 201 cases of bronchial asthma, ova or larvae of one or other of three intestinal parasites were found in the stools in 198. Over 90 per cent has ascariasis, 12 patients strongyloidiasis, and two Necator americanus. None of these three parasites were found in a group of allergy-free controls.
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David C. H. Tullis (1970) studied this question.
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