The Inspection of meats for animal parasites Volume 19-29

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 Excerpt: ...the Beef-measle Bladder Worm in several characters, which render a differential diagnosis comparatively easy, as seen from the following table: Cysticercusbovit. Echinococcus, p. 113. One unarmed head present..' Head absent'or numerous armed heads present in brood capsules (p. 116). Cuticle thin Cuticle thiclc and laminated (p. 116). Form oval Form round. A positive diagnosis of the younger stages of G. bovis (i. e., before the head has developed), or of degenerated specimens, is sometimes more difficult; the younger stages and the totally degenerated specimens will not develop further if eaten; the specimens which are only partially degenerated may, however, still retain enough vitality to develop into adult tapeworms. The oval or pyriform body gives a probable diagnosis for the younger stages, while the presence of calcareous corpuscles (seen only with the microscope) furnishes a method of diagnosis for the degenerated forms. Even in completely degenerated cysts the calcareous bodies may be discovered; these should, however, not be mistaken for fat globules which are more strongly refractive, possess a broader and darker edge, and do not change on addition of acetic acid. It is more difficult to distinguish the calcareous corpuscles from certain crystals of calcium carbonate; the latter lie in clumps and overlap each other, and upon being treated with mineral acids (as weak hydrochloric acid) completely disappear, while when the calcareous corpuscles are treated with acids their organic base retains the original form. Rissling gives the following method for determining the presence of cysticerci in chopped meat and sausage, hut its application does not seem very practicable, for this country at least. It appears to us much better to inspect meat for measl...