scholarly journals Rickettsial infections of dogs, horses and ticks in Juiz de Fora, southeastern Brazil, and isolation of Rickettsia rickettsii from Rhipicephalus sanguineus ticks

2010 ◽  
Vol 25 (2) ◽  
pp. 148-155 ◽  
Author(s):  
R. C. PACHECO ◽  
J. MORAES-FILHO ◽  
E. GUEDES ◽  
I. SILVEIRA ◽  
L. J. RICHTZENHAIN ◽  
...  
Keyword(s):  
Rhipicephalus Sanguineus ◽  
Southeastern Brazil ◽  
Rickettsia Rickettsii ◽  
Rickettsial Infections

Rickettsia rickettsii infecting Rhipicephalus sanguineus sensu lato (Latreille 1806), in high altitude atlantic forest fragments, Ceara State, Brazil

Acta Tropica ◽  
2017 ◽  
Vol 173 ◽  
pp. 30-33 ◽  
Author(s):  
Arannadia Barbosa Silva ◽  
Myrian Morato Duarte ◽  
Robson da Costa Cavalcante ◽  
Stefan Vilges de Oliveira ◽  
Vinicius Figueiredo Vizzoni ◽  
...  
Keyword(s):  
High Altitude ◽  
Atlantic Forest ◽  
Rhipicephalus Sanguineus ◽  
Forest Fragments ◽  
Rickettsia Rickettsii ◽  
Rhipicephalus Sanguineus Sensu Lato

The Dynamics of Ticks and Capybaras in a Residential Park Area in Southeastern Brazil: Implications for the Risk of Rickettsia rickettsii Infection

2019 ◽  
Vol 19 (10) ◽  
pp. 711-716 ◽  
Author(s):  
Fernanda B. Passos Nunes ◽  
Silvio Carvalho da Silva ◽  
Alex Deiws Cieto ◽  
Marcelo B. Labruna
Keyword(s):  
Southeastern Brazil ◽  
Rickettsia Rickettsii ◽  
Park Area

Rickettsia rickettsii (Rickettsiales: Rickettsiaceae) Infecting Amblyomma sculptum (Acari: Ixodidae) Ticks and Capybaras in a Brazilian Spotted Fever-Endemic Area of Brazil

2019 ◽  
Vol 57 (1) ◽  
pp. 308-311 ◽  
Author(s):  
Francisco B Costa ◽  
Monize Gerardi ◽  
Lina de C Binder ◽  
Hector R Benatti ◽  
Maria Carolina de Azevedo Serpa ◽  
...  
Keyword(s):  
Guinea Pig ◽  
Infection Rate ◽  
Guinea Pigs ◽  
Endemic Area ◽  
Spotted Fever ◽  
Immunofluorescence Assay ◽  
Southeastern Brazil ◽  
Rickettsia Rickettsii ◽  
Brazilian Spotted Fever ◽  
Low Incidence

Abstract The bacterium Rickettsia rickettsii is the agent of Brazilian spotted fever (BSF), a highly fatal disease that is transmitted in Brazil mainly by the tick Amblyomma sculptum Berlese, which uses capybaras (Hydrochoerus hydrochaeris Linnaeus) as major hosts. In 2015, we captured nine capybaras in a BSF-endemic area of southeastern Brazil. From each capybara, we collected blood sera that were tested through the immunofluorescence assay using Rickettsia spp. antigens, and A. sculptum ticks, processed for isolation of R. rickettsii through guinea pig inoculation. All capybaras (100%) were seroreactive to Rickettsia spp., with highest titers to R. rickettsii. A total of 166 A. sculptum ticks were macerated and inoculated into nine guinea pigs, from which only one presented high fever and seroconverted to R. rickettsii. Blood from this febrile animal was inoculated into additional guinea pigs (guinea pig passages), which also became febrile and seroconverted, or when euthanized during the fever period, their internal organs (spleen, lung) were shown to contain R. rickettsii DNA. The present rickettsial isolate has been maintained cryopreserved as infected guinea pig organs. There was at least one R. rickettsii-infected tick among the 166 macerated ticks, giving a minimal infection rate of 0.6% (1/166). This infection rate is within the range of previous studies, which reported that only 0.05% to at most 1.28% A. sculptum ticks were infected by R. rickettsii in other BSF-endemic areas. These low infection rates support the low incidence of BSF, despite of A. sculptum being the most frequent human-biting tick in southeastern Brazil.

scholarly journals Serosurvey of Rickettsia spp. in cats from a Brazilian spotted fever-endemic area

2019 ◽  
Vol 28 (4) ◽  
pp. 713-721
Author(s):  
Juliana Cristina Rebonato Mendes ◽  
Louise Bach Kmetiuk ◽  
Camila Marinelli Martins ◽  
Aurea Maria Oliveira Canavessi ◽  
Tatiana Jimenez ◽  
...  
Keyword(s):  
Endemic Area ◽  
Spotted Fever ◽  
Rhipicephalus Sanguineus ◽  
Southeastern Brazil ◽  
Rickettsia Parkeri ◽  
Rickettsia Felis ◽  
Rickettsia Species ◽  
Brazilian Spotted Fever ◽  
Endemic Areas ◽  
The University

Abstract Rickettsia spp. bacteria are responsible for tick-borne diseases worldwide, mostly maintained by rickettsial amplifiers capybaras in Brazilian endemic areas. The campus of the University of São Paulo, in southeastern Brazil, is an area endemic for Brazilian spotted fever (BSF), with high density of capybaras and Amblyomma spp., along with confirmed human cases. Besides capybaras, the university has also an in-campus high population of sheltered and free-roaming cats. Accordingly, the aim of this study was to determine the prevalence and characteristics associated with Rickettsia rickettsii, Rickettsia parkeri and Rickettsia felis exposure among cats in a BSF-endemic area. Out of 51 cats sampled, 23/35 shelter (65.7%) and 5/16 free-roaming (31.2%) were positive (titers ≥ 64) for at least one Rickettsia species. Ticks species were present in 3/16 free-roaming cats (18.8%), consisting of Amblyomma spp., nymphs of Amblyomma sculptum and adult Rhipicephalus sanguineus sensu lato. Despite sharing the capybaras environment, the seropositivity among the free-roaming and shelter cats was lower than owned cats in other endemic areas. Whether equally or less exposed to rickettsial infection, compared with owned cats in endemic areas, free-roaming and shelter cats may be used as environmental sentinels for human exposure to rickettsiae in such areas.

scholarly journals Report on ticks collected in the Southeast and Mid-West regions of Brazil: analyzing the potential transmission of tick-borne pathogens to man

1999 ◽  
Vol 32 (6) ◽  
pp. 613-619 ◽  
Author(s):  
Luiz Tadeu Moraes Figueiredo ◽  
Soraya Jabur Badra ◽  
Luiz Eloy Pereira ◽  
Matias Pablo Juan Szabó
Keyword(s):  
Close Contact ◽  
Spotted Fever ◽  
Rhipicephalus Sanguineus ◽  
Domestic Animals ◽  
Boophilus Microplus ◽  
Amblyomma Cajennense ◽  
Wild Mammals ◽  
Rickettsia Rickettsii ◽  
Boophilus Annulatus ◽  
Hydrochaeris Hydrochaeris

Specimens of ticks were collected in 1993, 1996, 1997, and 1998, mostly from wild and domestic animals in the Southeast and Mid-West regions of Brazil. Nine species of Amblyommidae were identified: Anocentor nitens, Amblyomma cajennense, Amblyomma ovale, Amblyomma fulvum, Amblyomma striatum, Amblyomma rotundatum, Boophilus microplus, Boophilus annulatus, and Rhipicephalus sanguineus. The potential of these tick species as transmitters of pathogens to man was analyzed. A Flaviviridade Flavivirus was isolated from Amblyomma cajennense specimens collected from a sick capybara (Hydrochaeris hydrochaeris). Amblyomma cajennense is the main transmitter of Rickettsia rickettsii (=R. rickettsi), the causative agent of spotted fever in Brazil. Wild mammals, mainly capybaras and deer, infested by ticks and living in close contact with cattle, horses and dogs, offer the risk of transmission of wild zoonosis to these domestic animals and to man.

scholarly journals Distribution of Rickettsia rickettsii in ovary cells of Rhipicephalus sanguineus (Latreille1806) (Acari: Ixodidae)

2011 ◽  
Vol 4 (1) ◽  
pp. 222 ◽  
Author(s):  
Luís da Silva Costa ◽  
Pablo Nunes ◽  
João Soares ◽  
Marcelo Labruna ◽  
Maria Camargo-Mathias
Keyword(s):  
Rhipicephalus Sanguineus ◽  
Ovary Cells ◽  
Rickettsia Rickettsii

scholarly journals Spotted fever group rickettsial infection in dogs and their ticks from domestic–wildlife interface areas in southeastern Brazil

2020 ◽  
Vol 29 (1) ◽  
Author(s):  
Sabrina Destri Emmerick Campos ◽  
Nathalie Costa da Cunha ◽  
Camila de Souza Cerqueira Machado ◽  
Niara Vanat Nadal ◽  
Eloy Silva Seabra Junior ◽  
...  
Keyword(s):  
Natural Infection ◽  
Spotted Fever ◽  
Rhipicephalus Sanguineus ◽  
Southeastern Brazil ◽  
Spotted Fever Group ◽  
Forest Fragments ◽  
Rickettsia Parkeri ◽  
Chain Reactions ◽  
Glta Gene ◽  
Pcr Targeting

Abstract Rickettsia rickettsii is the causative agent of Brazilian spotted fever (BSF), for which humans and dogs are both susceptible. Dogs are sentinels in serological surveys, however, canine disease is rarely reported. Therefore, we aimed to evaluate natural infection by spotted fever group (SFG) Rickettsia spp. in dogs and ticks collected from domiciles close to forest fragments, featuring domestic–wildlife interface areas. Samples from 115 dogs and 135 ixodids were assessed by polymerase chain reactions (PCR) targeting the gltA gene for Rickettsia spp. and the ompA gene for the SFG rickettsial species. One dog (0.87%; 1/115) was positive for R. rickettsii. This dog presented nonspecific laboratory and clinical abnormalities (thrombocytopenia, hyperproteinemia, lymph node enlargement, emaciation, anorexia, and lethargy). Rickettsia parkeri was identified in 2.96% (4/135) of the ticks (Amblyomma sculptum, A. aureolatum, and Rhipicephalus sanguineus). This study confirmed the presence of SFG bacteria in non-endemic and preserved locations, where domestic and wild populations interact. We reinforce the fact that the dog is susceptible to natural R. rickettsii infection. Although this is a rare finding, preventive measures should be taken against BSF in the studied areas. Finally, R. parkeri infection is possibly being demonstrated in A. sculptum for the first time.

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