Comparative Susceptibility of Larval Stages of Amblyomma aureolatum, Amblyomma cajennense, and Rhipicephalus sanguineus to Infection by Rickettsia rickettsii

Labruna, Marcelo Bahia; Ogrzewalska, Maria; Pintér, Adriano; Horta, Maurício Cláudio

doi:10.1093/jmedent/45.6.1156

Cited by 64 publications

(81 citation statements)

References 10 publications

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“…group have been found in animals in Almirante Tamandaré, a non-endemic area, reinforces the notion that BSF is an important reemerging zoonosis in Brazil. Negative PCR tests for ticks could be explained by the small sample of ticks examined and also the varying refractory effect to the pathogen (LABRUNA et al, 2008), with lethal effect from R. rickettsii (NIEBYLSKI et al, 1999) that may alter the host-pathogen relationship.…”

Section: Discussionmentioning

confidence: 99%

Serological survey of Rickettsia sp. in horses and dogs in an non-endemic area in Brazil

Batista

Silva

Green

et al. 2010

Rev. Bras. Parasitol. Vet.

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Brazilian Spotted Fever (BSF) is a lethal rickettsiosis in humans caused by the bacteria Rickettsia rickettsii, and is endemic in some areas of Brazil. Horses and dogs are part of the disease's life cycle and they may also serve as sentinel animals in epidemiological studies. The first human BSF case in the State of Paraná was reported in 2005. The present study was conducted in the municipality of Almirante Tamandaré, where no previous case of BSF was reported. Serum samples were collected from 71 horses and 20 dogs from nine properties in the area. Ticks were also collected from these animals. All farmers completed a questionnaire about their knowledge of BSF and animal health management. Serum samples were analyzed by indirect immunofluorescent-antibody assay (IFA) using R. rickettsii and R. parkeri as antigens. Ticks were analyzed by PCR for Rickettsia sp., and all of them were PCR-negative. Six horses (8.45%) and 4 dogs (20%) were identified as seropositive. Farmers were not aware of the correlation between the presence of ticks and risk of BSF. Although a non-endemic area, Almirante Tamandaré is a vulnerable environment for BSF and effective tick control measures are required.

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Section: Discussionmentioning

confidence: 99%

Serological survey of Rickettsia sp. in horses and dogs in an non-endemic area in Brazil

Batista

Silva

Green

et al. 2010

Rev. Bras. Parasitol. Vet.

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“…In the laboratory, R. sanguineus larvae presented a high susceptibility of infection with R. rickettsii (LABRUNA et al, 2008;PIRANDA et al, 2011). Furthermore, this species has also been naturally infected by rickettsiae, from the spotted fever group MORAES-FILHO et al, 2009), with a high prevalence in the Brazilian Southeast region, constituting a disease which is difficult to diagnose (DEL FIOL et al, 2010), since the symptoms may be confused with other diseases and, if not treated early, it can lead to death .…”

Section: Introductionmentioning

confidence: 99%

Rhipicephalus sanguineus sensu lato(Ixodidae) in synantropic rodents in Rio Grande do Sul, Brazil

Winkel

Ribeiro

Antunes

et al. 2014

Rev. Bras. Parasitol. Vet.

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Rhipicephalus sanguineus, the brown dog tick, is responsible for maintaining and transmitting various pathogens, both in animals and human beings, and it is of great sanitary importance. This communication reports the first occurrence of Rhipicephalus sanguineus sensu lato parasitizing Rattus norvegicus in the state of Rio Grande do Sul, Brazil, and it is also the first record of this tick species parasitizing Rattus rattus in Brazil. The rodents were captured from the port area, located in the city of Pelotas, Rio Grande do Sul, Brazil. We collected 6 larvae of this tick species from 2 male R. rattus individuals, and 3 larvae from 2 female R. norvegicus individuals; parasitized specimens of both rodent species were captured from different sites within the experimental area. This record broadens the number of Rhipicephalus sanguineus sensu lato hosts in urban areas, indicating the need for continued monitoring on population density for both R. sanguineus and synanthropic rodents.Keywords: Tick, Rhipicephalus sanguineus, Rattus norvegicus, Rattus rattus. ResumoRhipicephalus sanguineus, carrapato-vermelho-do-cão, é responsável por manter e transmitir diversos patógenos tanto para animais quanto para o homem, sendo de grande importância sanitária. Essa comunicação relata a primeira ocorrência de Rhipicephalus sanguineus sensu lato parasitando Rattus norvegicus no Estado do Rio Grande do Sul e, pela primeira vez, Rattus rattus no Brasil. Os roedores foram capturados na área portuária da cidade de Pelotas, Rio Grande do Sul, Brasil. Foram coletadas seis larvas desse carrapato em dois machos de R. rattus e três larvas em duas fêmeas de R. norvegicus. As duas espécies de roedores parasitados foram capturadas em pontos distintos na área do experimento. Esse registro amplia o número de hospedeiros de Rhipicephalus sanguineus sensu lato em áreas urbanas, indicando a necessidade de monitoramento contínuo da densidade populacional, tanto de R. sanguineus quanto de roedores sinantrópicos.

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“…Sin embargo, las tasas de infección por R. rickettsii en las garrapatas son bajas en condiciones naturales (8)(9)(10). En el caso de A. cajennense, puede atribuirse principalmente a que esta garrapata es menos propensa a la infección por R. rickettsii que otras especies (11). El papel de huéspedes amplificadores vertebrados que desarrollen grandes rickettsiemias es indispensable para el mantenimiento de la rickettsia en su ciclo enzoótico, al infectar nuevas garrapatas y comenzar nuevos linajes de garrapatas infectadas (12 (10).…”

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Vigilancia de la infección por Rickettsia sp. en capibaras (Hydrochoerus hydrochaeris) un modelo potencial de alerta epidemiológica en zonas endémicas

et al. 2011

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, 2008). El presente estudio reporta por primera vez la presencia de infección natural por rickettsia del grupo de las fiebres manchadas en capibaras de Colombia. Los hallazgos sugieren que los capibaras pueden ser usados como potenciales centinelas de la circulación de rickettsias y marcadores de las áreas de riesgo para la transmisión de rickettsiosis.Palabras clave: Rickettsia sp., infecciones por rickettsiaceae, roedores, garrapatas, técnica indirecta del anticuerpo fluorescente, Colombia. Surveillance of Rickettsia sp. infection in capybaras (Hydrochoerus hydrochaeris) a potential model of epidemiological alert in endemic areasIntroduction. Capybaras (Hydrochoerus hydrochaeris) are considered amplifying hosts of Rickettsia sp. These rodents are usually parasitized by the tick vector, Amblyomma cajennense, the main vector of rickettsioses in humans and animals in South America. Capybaras can be used as sentinels in detection of circulation of rickettsiae.Objective. Antibodies to rickettsiae of spotted fever group were detected in capybaras in a rural area of Cordoba Province, northern Colombia. Materials and methods. Sera were analyzed from 36 capybaras in a rural area of Monteria (village of San Jeronimo) in Córdoba. For the detection of IgG antibodies, indirect immunofluorescence was performed. The antigens were derived from R. rickettsia strain Taiaçu isolated in Brazil. Capybara sera were diluted 1:64 for IFA analysis. Ticks were collected from each capybara (also known as chigüiro) and identified to species.Results. The seroprevalence of spotted fever group Rickettsia was 22% (8 capybaras). Four sera had a titer of 1:64, 3 had a titer of 1:128 and one serum had a titer of 1:512. All ticks removed from the capybaras (n=933) were taxonomically identified as Amblyomma cajennense. Conclusion. Colombia has areas endemic for rickettsioses, as indicated by confirmed annual outbreaks. The current study reports the first evidence of natural rickettsial infection of the spotted fever group in capybaras from Colombia. The findings suggest that capybaras can be used as sentinels for the circulation of rickettsiae and can identify endemic areas for the transmission of rickettsial diseases.

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Comparative Susceptibility of Larval Stages of Amblyomma aureolatum, Amblyomma cajennense, and Rhipicephalus sanguineus to Infection by Rickettsia rickettsii

Cited by 64 publications

References 10 publications

Serological survey of Rickettsia sp. in horses and dogs in an non-endemic area in Brazil

Serological survey of Rickettsia sp. in horses and dogs in an non-endemic area in Brazil

Rhipicephalus sanguineus sensu lato(Ixodidae) in synantropic rodents in Rio Grande do Sul, Brazil

Vigilancia de la infección por Rickettsia sp. en capibaras (Hydrochoerus hydrochaeris) un modelo potencial de alerta epidemiológica en zonas endémicas

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