Human hantavirus disease occurs throughout much of South America. The rodent hosts and the specific etiologic agent(s) are largely unknown, but many reported cases occurred within the habitation ranges of oryzomine rodents (rice rats). We have identified a genetically novel hantavirus (Rio Mamore virus [RM]) of the pygmy rice rat Oligoryzomys microtis in Bolivia. The complete sequence of the small (S) genome and the partial sequence of the medium (M) genome are described. This virus is closely related to the newly identified human pathogen Andes virus from Patagonia. To facilitate improved diagnosis of hantavirus infections in South America, we have expressed the complete nucleocapsid protein of RM in Escherichia coli and affinity-purified it for use in an ELISA and Western blot assays for antibodies to RM.
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- Research conducted on 3,400 febrile patients in Peru between 2020-2021 revealed a positive case of Rio Mamore hantavirus, highlighting the endemic presence of this virus in the region.
- Genetic analysis showed a strong similarity to past rodent-associated hantavirus cases from Loreto, indicating ongoing circulation.
- Findings suggest the need for enhanced hantavirus diagnostics and surveillance in Peru and Latin America due to the detection of multiple distinct hantavirus strains.
A new species of Sturisoma Swainson, 1838 (Loricariidae: Loricariinae), from the Madeira River basin, with a discussion of historical biogeography of western Amazonas and Paraguay River basins.
J Fish Biol
January 2023
Departamento de Vertebrados - Setor de Ictiologia, Universidade Federal do Rio de Janeiro, Museu Nacional, Rio de Janeiro, Brazil.
A new loricariin species of Sturisoma is described from the Cautário, Guaporé, Mamoré, Machado and Soteiro rivers, Madeira River basin, in Bolivia and Brazil. The new species is distinguished from its congeners by the presence of a middorsal longitudinal, thin dark brown stripe on the caudal peduncle, extending from two or three plates posterior to the dorsal-fin base, reaching the origin of the caudal fin, or one or two plates anterior to the origin of the caudal fin; small squarish anteriormost abdominal plates; and a middorsal longitudinal dark-brown stripe from first predorsal plate to near the dorsal-fin origin. Furthermore, the new species is diagnosed from congeners by plate morphology, counts on the median series, coalescent plates and ventrolateral thoracic plates, in addition to measurements related to body and head structures.
View Article and Find Full Text PDFNEOTROPICAL CARNIVORES: a data set on carnivore distribution in the Neotropics.
Ecology
November 2020
Laboratório de Ecologia Espacial e Conservação (LEEC), Departamento de Biodiversidade, Instituto de Biociências, Universidade Estadual Paulista (UNESP), Rio Claro, SP, 13506-900, Brazil.
Mammalian carnivores are considered a key group in maintaining ecological health and can indicate potential ecological integrity in landscapes where they occur. Carnivores also hold high conservation value and their habitat requirements can guide management and conservation plans. The order Carnivora has 84 species from 8 families in the Neotropical region: Canidae; Felidae; Mephitidae; Mustelidae; Otariidae; Phocidae; Procyonidae; and Ursidae.
View Article and Find Full Text PDFDevelopment of RT-qPCR and semi-nested RT-PCR assays for molecular diagnosis of hantavirus pulmonary syndrome.
PLoS Negl Trop Dis
December 2019
Department of Arbovirology and Hemorrhagic Fevers, Evandro Chagas Institute, Ananindeua, Brazil.
Hantavirus Pulmonary Syndrome is an, often fatal, emerging zoonotic disease in the Americas caused by hantaviruses (family: Hantaviridae). In Brazil, hantavirus routine diagnosis is based on serology (IgM-ELISA) while RT-PCR is often used to confirm acute infection. A Semi-nested RT-PCR and an internally controlled RT-qPCR assays were developed for detection and quantification of four hantaviruses strains circulating in the Brazilian Amazon: Anajatuba (ANAJV) and Castelo dos Sonhos (CASV) strains of Andes virus (ANDV) species; and Rio Mamoré (RIOMV) and Laguna Negra (LNV) strains of LNV species.
View Article and Find Full Text PDFDescription of a new Hemigrammus Gill (Characiformes: Characidae) from the río Madeira basin in Peru and Bolivia.
Zootaxa
April 2019
Instituto Nacional de Pesquisas da Amazônia, Programa de Pós-Graduação em Biologiade Água Doce e Pesca Interior. Av. André Araújo, 2936, 69060-001 Manaus, Amazonas, Brazil..
We described herein a new Hemigrammus from the río Madre de Dios and rio Mamoré basins in southeastern Peru and Bolivia. The new species possess a color pattern similar to those belonging to the Hemigrammus lunatus species-group, i.e.
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