. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. 118 INTESTINAL FLAGELLATES AND CILLATES the general form of the body and in the possession of a parabasal body and an undulating membrane, but have an additional free flagellum. In Cercomonas (Fig. 29C), according to Wenyon, the trailing flagellum is attached to the side of the body as far as the posterior end, usually being continued as a free Fig. 29. Bi-flagellated parasites. A, Bodo; note absence of parabasal body. B, Prowazekia; note parabasal body (par. b.). C, Cercomonas; note trailin
. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. 118 INTESTINAL FLAGELLATES AND CILLATES the general form of the body and in the possession of a parabasal body and an undulating membrane, but have an additional free flagellum. In Cercomonas (Fig. 29C), according to Wenyon, the trailing flagellum is attached to the side of the body as far as the posterior end, usually being continued as a free Fig. 29. Bi-flagellated parasites. A, Bodo; note absence of parabasal body. B, Prowazekia; note parabasal body (par. b.). C, Cercomonas; note trailing flagellum attached to side of body. This is not recognized as a flagellum by some workers. X 2000. (After Wenyon.) According to others Cercomonas has only a single flagellum, the free one at the anterior end. Bodo and Prowazekia (Fig. 29A and B) both have two flagella, one waving anteriorly, the other trail- ing behind; Prowazekia differs from Bodo, and also from Cercomo- nas, in having a parabasal body. Of these parasites only Prowazekia, of which several poorly defined species have been recorded from man, can be considered a true human parasite; Bodo and Cercomonas, as found in freshly passed faeces, are probably free-living forms which have been ingested accidentally as cysts with water or food. Wenyon states that all three genera grow readily in cultures a«id form small round cysts, two to eight fi (yj—^ to ^^^^ of an inch) in diameter. They probably all pass through an ameboid stage in which they are indistinguishable from the small amebse of the " Umax " group. Multi-flagellate Intestinal Protozoa Trichomonas intestinalis. — Of the several flagellates which have been found in the human digestive tract and fseces, Tricho- monas is the commonest. It makes its home in the upper. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not
Size: 2379px × 1050px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1900, bookdecade1910, bookpublishernewyorkjwiley
