First report of the intestinal helminth community in the broad-headed spiny-rat Clyomys laticeps (Rodentia, Echimyidae)

Rodrigues, Fernanda Oliveira; Leiner, Natália Oliveira; Ferrando, Claire Pauline Röpke; Andrade-Silva, Beatriz Elise de; Gentile, Rosana; Maldonado, Arnaldo

doi:10.1590/s1984-29612020068

Cited by 1 publication

(1 citation statement)

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“…Various hystrichognathi, either wild or in captivity, have been reported as reservoir hosts of endo and ectoparasites ( Dittmar, 2002 ; de la Cruz et al, 2003 ; Gressler et al, 2010 ; Regolin et al, 2015 ; Jones and Garcia, 2019 ). Among those, Cavia sp and the broad-headed spiny rat Clyomys laticeps , are examples of intermediate hosts of important endemic South American zoonosis such as leishmaniosis and helminthosis ( Cássia-Pires et al, 2014 ; Cardoso et al, 2015 ; Paranaiba et al, 2018 ; Rodrigues et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

First record of an infection by tissue cyst-forming coccidia in wild vizcachas (Lagostomus maximus, Rodentia) of Argentina

Cwirenbaum

Schmidt

Cortasa

et al. 2021

International Journal for Parasitology: Parasites and Wildlife

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Endoparasites of the Sarcocystidae family share the ability to form tissue cysts in their intermediate hosts, ultimately leading to pathogenesis in the definitive hosts that include various mammals, reptiles and birds. In our research on the endocrinology of the female vizcachas ( Lagostomus maximus ), we have found abnormal cystic structures in the ovaries of some individuals. So far, no cases of infection by tissue cyst-forming parasites have been reported in this species. To evaluate whether this autochthonous wild rodent is an intermediate host of an undescribed endoparasite, histological sections from various organs were examined. Pinhead-sized tissue cysts were found in the ovaries, mammary glands, uterus, pituitary, brain, adrenals and spleen, of both pregnant and non-pregnant females. The presence of cysts in the adult brain and embryonic tissue is indicative of the ability of the parasite to cross both the blood-brain and placental barriers. The infected brains exhibited a lower cyst density than that seen in other organs. Regardless of their location in superficial or deep tissue, the cysts were surrounded by a layer of connective tissue. Histologically, the cyst wall consisted of an outer layer of fibroblasts and collagen fibers, and an inner, granular-looking layer composed of host nucleated cells surrounding thousands of spindle-shaped bradyzoites. Outside the cysts, the host cellular structures showed normal appearance. The remarkable morphological similarities between the cysts studied here with those reported in naturally infected rabbits from an area neighboring the one inhabited by the vizcachas point to Besnoitia sp. as a plausible candidate. More studies will be necessary to confirm the identity of the parasite. Nevertheless, this is the first report of L. maximus as an intermediate host for a tissue cyst-forming coccidia.

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