Abstract

Fibrosarcomatous mesotheliomas were associated with long-standing intraperitoneal infections of the larval stages (metacestodes) of Echinococcus vogeli and Taenia crassiceps in gerbils and Taenia polyacantha in a northern vole. The tumor apparently induced by E. vogeli was readily transferable in gerbils by intraperitoneal or subcutaneous inoculation of ascitic fluid containing tumor cells or fragments of tumor tissue, and was characterized by rapid growth, early death of the host, and host specificity. The carcinogenic reaction of the mesothelium to the larval cestodes may be related to the duration of infection and the volume of cysticerci or vesicles in the peritoneal cavity.

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