. Biology of the laboratory mouse. Mice as laboratory animals; Mice; Animals, Laboratory; Mice. 36o BIOLOGY OF THE LABORATORY MOUSE Taenia taeniaeformis (batsch, 1786).—Also known as T. crassicollis. This is a tapeworm which commonly employs the mouse or rat as an inter- mediate host. The larval stage, which bears the name Cysticercusfasciolaris, is a strobilocercus (Fig. 140). It develops within a cyst in the liver of the mouse or rat. The adult is a very common tapeworm of the intestine of the domestic cat having also been reported from wild cats (Fig. 141). Infection in mice is effected by
. Biology of the laboratory mouse. Mice as laboratory animals; Mice; Animals, Laboratory; Mice. 36o BIOLOGY OF THE LABORATORY MOUSE Taenia taeniaeformis (batsch, 1786).—Also known as T. crassicollis. This is a tapeworm which commonly employs the mouse or rat as an inter- mediate host. The larval stage, which bears the name Cysticercusfasciolaris, is a strobilocercus (Fig. 140). It develops within a cyst in the liver of the mouse or rat. The adult is a very common tapeworm of the intestine of the domestic cat having also been reported from wild cats (Fig. 141). Infection in mice is effected by ingesting the eggs. In the intestine the shells are digested off, liberating the onchospheres which penetrate the wall of the intestine and make their way to the liver via the hepatic portal system. On the second day after ingestion of the egg the onchosphere has reached the capillaries of the liver. A cyst wall forms around the larva which develops into the strobilocercus lying free within the cyst bathed in a clear, yellowish fluid. Cats become infected by ingesting infected mouse or rat livers. ii This is an especially interesting parasite in that from Pj(j the walls of the cysts sarcomata of the liver develop. Scolex of Taenia Bullock and Curtis (7) in 1920 reported producing taeniaeformis cysticercus tumors in some 201 rats by feeding them the (X15). {From gggg Qf ^]^g parasite. Later it was used extensively in a . a] er eu- ^^^^qj. experiments, especially by Dunning and Curtis (12). wan.) II' 1 • T 1 • Except when bemg used m tumor studies, this parasite quite obviously would be very undesirable in laboratory mice. However, control measures are not difficult, for if the primary hosts, , cats, are eliminated from the laboratory, the main source of infection is removed. If it is desirable to have a cat around the building, as sometimes one proves quite indispensable in keeping down wild mice, the cat should not have access to the feed room or be permitted to c
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