title: Oropouche virus experimental infection in the golden hamster (Mesocrisetus auratus).
abstract: Oropouche virus (OROV), of the family Bunyaviridae, is the second most frequent arbovirus causing febrile disease in Brazil. In spite of this, little is known about pathogenesis of OROV infection. This report describes an experimental model of OROV in golden hamster (Mesocricetus auratus). Following subcutaneous inoculation of OROV, over 50% of the animals developed disease characterized by lethargy, ruffled fur, shivering, paralysis, and approximately one third died. Animals were sacrificed on days 1, 3, 5, 8 and 11 post-inoculation to collect tissue samples from brain, heart, liver, lung, spleen, muscle and blood for virus titration, histology and OROV immunohistochemistry. OROV was detected in high titers in blood, liver and brain, but not in the other organs. Histopathology revealed meningoencephalitis and hepatitis, with abundant OROV antigen detected in liver and brain. Diffuse galectin-3 immunostaining in brain and liver supports microglial and Kupfer cells activation. This is the first description of an experimental model for OROV infection and should be helpful to study pathogenesis and possibly to test antiviral interventions such as drugs and vaccine candidates.
authors: Department of Cell and Molecular Biology, University of São Paulo School of Medicine at Ribeirão Preto, Brazil. alcirhumberto@usp.br
authors: Alcir Humberto
authors: AH
authors: Rodrigues
authors: Rodrigo Ivo
authors: RI
authors: Santos
authors: Gabriel Maisonnave
authors: GM
authors: Arisi
authors: Emerson Soares
authors: ES
authors: Bernardes
authors: Maria Lúcia
authors: ML
authors: Silva
authors: Marcos Antônio
authors: MA
authors: Rossi
authors: Maria Beatriz Sampaio
authors: MB
authors: Lopes
authors: Eurico
authors: E
authors: Arruda
mesh_terms: D000825:Animal Structures / Q000473:pathology / Q000821:virology; D000818:Animals; D001938:Brazil; D002044:Bunyaviridae Infections / Q000473:pathology / Q000662:veterinary* / Q000821:virology; D006224:Cricetinae; D004195:Disease Models, Animal; D006524:Hepatitis, Viral, Animal / Q000473:pathology / Q000821:virology; D006651:Histocytochemistry; D008297:Male; D008590:Meningoencephalitis / Q000473:pathology / Q000662:veterinary / Q000821:virology; D008647:Mesocricetus / Q000821:virology; D008853:Microscopy; D016851:Orthobunyavirus / Q000472:pathogenicity*; D012376:Rodent Diseases / Q000473:pathology* / Q000821:virology*