Título:	New records of tick-associated spotted fever group Rickettsia in an Amazon-Savannah ecotone, Brazil.
Autor:	AGUIRREA, A. A. R. e GARCIA, M. V. COSTA, I. N. da CSORDAS, B. G. RODRIGUES, V. da S. MEDEIROS, J. F. ANDREOTTI, R.
Afiliación:	Plataforma de Criação e Experimentação Animal/Fiocruz Rondônia/Oswaldo Cruz Foundation; Marcos Valério Garcia, Laboratórios de Biologia Molecular e do Carrapato/Brazilian Agricultural Research Corporation; Ivaneide Nunes da Costa, Laboratório de Entomologia Médica/Fiocruz Rondônia/Oswaldo Cruz Foundation; Bárbara Guimarães Csordasc, Laboratórios de Biologia Molecular e do Carrapato/Brazilian Agricultural Research Corporation; Vinícius da Silva Rodrigues, Laboratórios de Biologia Molecular e do Carrapato/Brazilian Agricultural Research Corporation; Jansen Fernandes Medeiros, Laboratório de Entomologia Médica/Fiocruz Rondônia/Oswaldo Cruz Foundation; RENATO ANDREOTTI E SILVA, CNPGC.
Año:	2018
Referencia:	Ticks and Tick-Borne Disease, v. 9, n. 4, p. 1038-1044, May 2018
Descripción:	Human rickettsiosis has been recorded in the Amazon Biome. However, the epidemiological cycle of causative rickettsiae has not been fully accounted for in the Amazon region. This study investigates the presence of spotted fever group (SFG) Rickettsia spp. in free-living unfed ticks of the Amblyomma genus. The study was conducted in seven municipalities in Rondonia State, Brazil, where the main biomes are Amazon forest, Brazilian Savannah and their ecotones (areas of ecological tension between open ombrophilous forest and savannah). The following tick species were collected: Amblyomma cajennense (sensu lato) s.l., A. cajennense (sensu stricto) s.s., A. coelebs, A. naponense, A. oblongoguttatum, A. romitii, A. scalpturatum and A. sculptum. A total of 167 adults, 248 nymphs and 1004 larvae were subjected to DNA extraction and polymerase chain reaction (PCR) to determine the presence of SFG Rickettsia spp. PCR-positive samples included: one A. cajennense s.s. female and one A. cajennense s.l. male from a rural area in Vilhena Municipality; 10 nymphs and a sample of larvae of A. cajennense s.l. from a periurban area in Cacoal Municipality; and an A. oblongoguttatum adult male from a rural area of Pimenta Bueno Municipality. All sequences obtained exhibited 100% identity with Rickettsia amblyommatis sequences. This is the first confirmation of SFG Rickettsia in an A. oblongoguttatum tick. Furthermore, this is the first record of SFG Rickettsia in the municipalities targeted by this study. These results warn that SFG Rickettsia circulation poses a threat in Rondonia State (among Amazon-Savannah ecotones), and that this threat is increased by the fact that SFG Rickettsia infect a human-biting tick species hitherto unconfirmed as a vector.
NAL Thesaurus:	Ecotones
Palabras clave:	Amazon-Savanna ecotone Amblyomma oblongoguttatum Rickettsia amblyommatis Brazilian spotted fever
Tipo de Material:	Artigo de periódico
Acceso:	openAccess
Aparece en las colecciones:	Artigo em periódico indexado (CNPGC)