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A fairly comprehensive search of medical textbooks does not reveal the association of Ascaris lumbricoides infestation with extreme anemia. It is noted, however, in Strümpell's Textbook of Medicine that "when Bothriocephalus latus or occasionally a taenia is present in the intestines there will often be an extremely severe anemia, quite like pernicious anemia."
In a case seen recently in a child, this pernicious anemia-like type of blood picture accompanying the ascaris infestation was so marked that it seems worthy of attention.
R. W., a 7 year old boy, puny in stature, of American parents of German descent, whose life had been spent in Milwaukee, had had only one outstanding illness prior to the present trouble, namely, a mild attack of measles, and a moderately severe attack of pertussis six months before coming under my observation. Because of his poor development, anemic appearance, repeated attacks of nosebleed, and
H. E. Bardenwerper. ASCARIS LUMBRICOIDES INFESTATION WITH EXTREME ANEMIA. JAMA. 1928;91(14):1037. doi:10.1001/jama.1928.92700140001011