Identifier: diagnosticmethod00webs (find matches)
Title: Diagnostic methods, chemical, bacteriological and microscopical : a text-book for students and practitioners
Year: 1909 (1900s)
Authors: Webster, Ralph W. (Ralph Waldo), 1873-1930
Subjects: Diagnosis Diagnosis
Publisher: Philadelphia : P. Blakiston's Son & Co.
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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Fig. 42.—Oxyuris vermi-cularis: to left, female; toright, male (considerablyenlarged); ^, anus; O,mouth; v, vulva. (Tysonafter Braun.) THE FECES. 139 free parents, are at first 0.22 mm. in length, but grow to 0.55 mm., then moultand assume a filariform or strongyloid character like that of the parasitic grand-parent. These gain access to the intestine of a new host in an unknown manneror shortly die. These worms may be found throughout the upper gastrointestinal tract,especially in the duodenum and upper part of the jejunum. The time elapsing
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Fig. 43.—Strongyloides intestinalis; on the left, a gravid female from human intestine(natural size 2.5 m.m). In the middle, a rhabditiform larva from fresh fecal matter, X 120;to the right, a filariform larva from culture, X 120. (Tyson after Braun.) between infections with the filariform larvae of the sexual generation and theappearance of the rhabditiform embryos of the parasitic type in the stoolsis between two and three weeks. The parthogenetic female types are usuallycalled the strongyloides intestinalis, while the free sexual form is styled strongy-loides stercoralis. This form is found widely distributed in Indo-China, the East Indies,Africa, Europe, and North and South America. The mode of transmission to

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