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Pacheco RC Moraes-Filho J Guedes E Silveira I Richtzenhain LJ Leite RC Labruna MB 《Medical and veterinary entomology》2011,25(2):148-155
The present study was performed in an area endemic for Brazilian spotted fever (BSF) in Juiz de Fora, state of Minas Gerais, Brazil, during the years 2007 and 2008, when fatal cases of BSF (caused by Rickettsia rickettsii) were reported. Adult ticks (Acari: Ixodidae) identified as Rhipicephalus sanguineus (Latreille) and Amblyomma cajennense (Fabricius) were collected from dogs and horses, respectively, and tested by polymerase chain reaction (PCR). Overall, 13.1% of the Rh. sanguineus ticks and none of the A. cajennense were found to be infected with R. rickettsii. Two isolates of R. rickettsii were successfully established in Vero cell culture from two Rh. sanguineus ticks. An indirect immunofluorescence assay (IFA) using R. rickettsii antigens detected blood serological reaction to R. rickettsii in 67.9% (53/78) of dogs and 41.0% (16/39) of horses living in the study area. Larval offspring from two Rh. sanguineus engorged females, naturally infected by R. rickettsii, were reared to adult stage in the laboratory. All active stages (larvae, nymphs, adults) remained 100% infected by R. rickettsii, which was efficiently transmitted to naïve rabbits. Overall, the results of the present study indicate a potential risk for transmission of R. rickettsii to humans by Rh. sanguineus, an occurrence yet to be documented in Brazil. 相似文献
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Poliana de Oliveira Figueiredo André Tavares da Silva-Fernandes Bruno Eduardo Fernandes Mota Galileu Barbosa Costa Iara Apolinário Borges Paulo César Peregrino Ferreira J?natas Santos Abrah?o Erika Martins Braga Erna Geessien Kroon Giliane de Souza Trindade 《Memórias do Instituto Oswaldo Cruz》2015,110(6):804-808
Vaccinia virus naturally circulates in Brazil and is the causative agent of a
zoonotic disease known as bovine vaccinia (BV). We retrospectively evaluated two
populations from the Amazon and Southeast Regions. BV outbreaks had not been reported
in these regions before sample collection. Neutralising antibodies were found in 13
individuals (n = 132) with titres ranging from 100 ≥ 6,400 neutralising units/mL.
Univariate analysis identified age and vaccination as statistically significant risk
factors in individuals from the Southeast Region. The absence of detectable
antibodies in vaccinated individuals raises questions about the protection of
smallpox vaccine years after vaccination and reinforces the need for surveillance of
Orthopoxvirus in Brazilian populations without evidence of previous outbreaks. 相似文献
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