Taenia martis Cysticercosis in a Common Marmoset (Callithrix jacchus)

<i>Taenia martis</i> cysticercosis is a rare but recently more frequently reported disease that can affect both human and non-human primates as aberrant hosts. A common marmoset was noticed as being affected by advancing weight loss that did not respond to therapy and finally had to be euthanized due to poor prognosis. A complete necropsy with gross evaluation and subsequent histological and molecular analyses was performed, revealing the presence of a cysticercosis in the thoracic and pelvic cavity and in the mesentery. Molecular analysis identified the cestode as <i>Taenia martis</i>. This is the fifth case of <i>Taenia martis</i> cysticercosis in a non-human primate and the first case in a platyrrhine primate.