PREVALENCE OF ANTIBODIES TO SPOTTED FEVER GROUP RICKETTSIAE IN HUMANS AND DOMESTIC ANIMALS IN A BRAZILIAN SPOTTED FEVER-ENDEMIC AREA IN THE STATE OF SÃO PAULO, BRAZIL: SEROLOGIC EVIDENCE FOR INFECTION BY RICKETTSIA RICKETTSII AND ANOTHER SPOTTED FEVER GROUP RICKETTSIA

2004 ◽  
Vol 71 (1) ◽  
pp. 93-97 ◽  
Author(s):  
MAURÍCIO C. HORTA ◽  
MANOELLA C. B. VIANNA ◽  
CLAUDIO L. MAFRA ◽  
TERESINHA T. S. SCHUMAKER ◽  
DAVID H. WALKER ◽  
...  
Keyword(s):  
Endemic Area ◽  
Spotted Fever ◽  
Domestic Animals ◽  
The State ◽  
Spotted Fever Group ◽  
Spotted Fever Group Rickettsiae ◽  
Rickettsia Rickettsii ◽  
Serologic Evidence ◽  
Brazilian Spotted Fever ◽  
Spotted Fever Group Rickettsia

scholarly journals DETECTION OF A Rickettsia GENOTYPE RELATED TO THE OLD WORLD INFECTING Amblyomma sculptum TICK IN AN ENDEMIC AREA OF BRAZILIAN SPOTTED FEVER

2019 ◽  
Vol 48 (3) ◽  
pp. 161-169 ◽  
Author(s):  
Gilberto Gazêta ◽  
Tayra Sato ◽  
Nicole Moura-Martiniano ◽  
Vinícius Vizzoni ◽  
Arannadia Silva ◽  
...  
Keyword(s):  
Endemic Area ◽  
Spotted Fever ◽  
Epidemiological Surveillance ◽  
Southeastern Brazil ◽  
Spotted Fever Group ◽  
Rickettsia Rickettsii ◽  
Rickettsia Monacensis ◽  
Minas Gerais State ◽  
Brazilian Spotted Fever ◽  
Spotted Fever Group Rickettsia

Brazilian Spotted Fever is an important tick-borne disease caused by Rickettsia rickettsii and transmitted mainly by the human-biting tick Amblyomma sculptum. During an epidemiological surveillance in Pedro Leopoldo, an endemic area of Minas Gerais State, southeastern Brazil, ectoparasites were collected from vertebrate hosts and from the environment. Rickettsial genes were obtained from a male A. sculptum and the resulting phylogenetic tree grouped this bacterium with Rickettsia sp. isolate Pampulha, a strain closely related to the pathogenic species Rickettsia tamurae and Rickettsia monacensis. This is the first report of sequencesphylogenetically related to R. tamurae and R. monacensis infecting A. sculptum in Brazil. KEY WORDS: Spotted Fever Group Rickettsia; Amblyomma sculptum; Spotted Fever focus;Ixodidae; Brazil.

scholarly journals Epidemiological aspects of the Brazilian spotted fever: serological survey of dogs and horses in an endemic area in the State of São Paulo, Brazil

1996 ◽  
Vol 38 (6) ◽  
pp. 427-430 ◽  
Author(s):  
Elba R.S. de Lemos ◽  
Raimundo D. Machado ◽  
José R. Coura ◽  
Maria A.A.M. Guimarães ◽  
Nelson Chagas
Keyword(s):  
Endemic Area ◽  
Spotted Fever ◽  
Domestic Animals ◽  
Sao Paulo ◽  
Spotted Fever Group ◽  
São Paulo ◽  
Serological Survey ◽  
Serum Samples ◽  
Blood Samples ◽  
Brazilian Spotted Fever

In order to obtain information on Brazilian spotted fever, a study in domestic animals was performed in the County of Pedreira, State of São Paulo, Brazil, where 17 human cases had been notified. Serum samples obtained from animals were tested by indirect immunofluorescence for detectable antibodies to spotted fever-group rickettsiae. Seropositivity was revealed in 12 (36.4%) of 33 dogs and seven (77.8%) of nine horses from the endemic area. For comparison, blood samples from dogs and horses from non endemic area were tested and four (12.9%) of 31 dogs and three (27.3%) of 11 horses were positive. The highest titers of antibodies by IFA (IgG > 1:1024) were found only in three dogs and six horses from endemic area. The results suggest that dogs as horses may serve as environmental sentinels for estabilishing the prevalence of foci of spotted fever in Brazil.

scholarly journals Detection of Rickettsia rickettsii in the tick Amblyomma cajennense in a new Brazilian spotted fever-endemic area in the state of Minas Gerais

2005 ◽  
Vol 100 (8) ◽  
pp. 841-845 ◽  
Author(s):  
Elizângela Guedes ◽  
Romário C Leite ◽  
Márcia CA Prata ◽  
Richard C Pacheco ◽  
David H Walker ◽  
...  
Keyword(s):  
Endemic Area ◽  
Spotted Fever ◽  
Minas Gerais ◽  
The State ◽  
Amblyomma Cajennense ◽  
Rickettsia Rickettsii ◽  
Brazilian Spotted Fever

scholarly journals Seroprevalence of Rickettsia rickettsii and Rickettsia parkeri in dogs during a Brazilian Spotted Fever outbreak in the State of Rio de Janeiro

2018 ◽  
Vol 70 (3) ◽  
pp. 667-674 ◽  
Author(s):  
I.T. Poubel ◽  
N.C. Cunha ◽  
A.B.M. Fonseca ◽  
A. Pinter ◽  
A.H. Fonseca ◽  
...  
Keyword(s):  
Rio De Janeiro ◽  
Spotted Fever ◽  
Immunofluorescence Assay ◽  
Spotted Fever Group ◽  
Ambient Conditions ◽  
Rickettsia Parkeri ◽  
Rickettsia Rickettsii ◽  
Brazilian Spotted Fever ◽  
Spotted Fever Group Rickettsia ◽  
Janeiro State

ABSTRACT The present paper is the first to perform this evaluation in dogs from the cities of Natividade, Porciuncula and Varre-Sai. The aim of this study is to search for Spotted Fever Group Rickettsia in canine sera using indirect immunofluorescence assay and to identify the probable causative agent of sera reactions in animals. Of the 253 sampled canines, 67.59% (171/253) were seroreactive for Rickettsia rickettsii and 11.07% (28/253) for Rickettsia parkeri, both in dilution 1:64. Titration of tested sera against R. rickettsii antigens reached 1:131.072 and, for R. parkeri, 1:4.096. We conclude that dogs are important sentinels for R. rickettsii infection, and can be infected regardless of sex, age, the habit of visiting woodlands or being in direct contact with equines and capybaras. Serological diagnosis has highlighted many dogs infected by R. rickettsii, and ambient conditions, such as the presence of flowing water bodies, was important for the occurrence of Brazilian Spotted Fever in the northwestern of Rio de Janeiro State.

scholarly journals Serosurvey of antibodies against spotted fever group Rickettsia spp. in horse farms in Northern Paraná, Brazil

2010 ◽  
Vol 19 (4) ◽  
pp. 259-261 ◽  
Author(s):  
Katia Tamekuni ◽  
Roberta dos Santos Toledo ◽  
Mauro de Freitas Silva Filho ◽  
Valeska Bender Haydu ◽  
Richard Campos Pacheco ◽  
...  
Keyword(s):  
Spotted Fever ◽  
Immunofluorescence Assay ◽  
Spotted Fever Group ◽  
Santa Fe ◽  
Southern Brazil ◽  
Seropositivity Rate ◽  
Rickettsia Rickettsii ◽  
Horse Farms ◽  
Brazilian Spotted Fever ◽  
Spotted Fever Group Rickettsia

Brazilian spotted fever (BSF) is an emerging disease most likely caused by Rickettsia rickettsii. The objective of the present study was to estimate the seroprevalence of BSF rickettsia infections in equines from six horse farms located in Londrina County, Paraná, Southern Brazil. Six owners of horse farms situated in Cambé, Santa Fé, Guaraci and Londrina municipalities participated in the study. All farms were located in areas where BSF has not been reported. A total of 273 horses were sampled and their sera were tested by indirect Immunofluorescence assay (IFA) using R. rickettsii and R. parkeri antigens. Titers equal to and greater than 64 were considered positive. Of 273 sera tested, 15 (5.5%) reacted to R. rickettsii and 5 (1.8%) to R. parkeri. Five out of the six farms studied revealed seropositive animals and seropositivity rate ranged from 0 to 13%. The titers ranged from 64 to 512, and four samples had a titer of 512. Nine animals reacted to R. rickettsii with titers four-fold higher than those for R. parkeri. These results suggest that horses in Northern Paraná may have been exposed to rickettsiae identical or closely related to R. rickettsii.

scholarly journals Serosurvey of Rickettsia spp. in dogs and humans from an endemic area for Brazilian spotted fever in the State of São Paulo, Brazil

2008 ◽  
Vol 24 (2) ◽  
pp. 247-252 ◽  
Author(s):  
Adriano Pinter ◽  
Maurício C. Horta ◽  
Richard C. Pacheco ◽  
Jonas Moraes-Filho ◽  
Marcelo B. Labruna
Keyword(s):  
Human Serum ◽  
Endemic Area ◽  
Spotted Fever ◽  
Sao Paulo ◽  
The State ◽  
The Other ◽  
São Paulo ◽  
Human Sera ◽  
Antibody Titers ◽  
Brazilian Spotted Fever

The present study provides a rickettsial serosurvey in 25 dogs and 35 humans in an endemic area for Brazilian spotted fever in the State of São Paulo, where the tick Amblyomma aureolatum is the main vector. Testing canine and human sera by indirect immunofluorescence against four Rickettsia antigens (R. rickettsii, R. parkeri, R. felis and R. bellii) showed that 16 (64%) of canine sera and 1 (2.8%) of human sera reacted to at least one of these rickettsial antigens with titers <FONT FACE=Symbol>³</FONT> 64. Seven canine sera and the single reactive human serum showed titers to R. rickettsii at least four times those of any of the other three antigens. The antibody titers in these 7 animals and 1 human were attributed to stimulation by R. rickettsii infection. No positive canine or human serum was attributed to stimulation by R. parkeri, R. felis, or R. bellii. Our serological results showed that dogs are important sentinels for the presence of R. rickettsii in areas where the tick A. aureolatum is the main vector of Brazilian spotted fever.

scholarly journals Spotted fever rickettsiosis in Coronel Fabriciano, Minas Gerais State

2003 ◽  
Vol 36 (4) ◽  
pp. 479-481 ◽  
Author(s):  
Márcio Antônio Moreira Galvão ◽  
Simone Berger Calic ◽  
Chequer Buffe Chamone ◽  
Cláudio Lísias Mafra S. ◽  
Gracco Cesarino Filho ◽  
...  
Keyword(s):  
Differential Diagnosis ◽  
Spotted Fever ◽  
Clinical Manifestations ◽  
Minas Gerais ◽  
Spotted Fever Group ◽  
Minas Gerais State ◽  
Brazilian Spotted Fever ◽  
Spotted Fever Group Rickettsia ◽  
Rickettsial Diseases

We report cases of spotted fever rickettsiosis in Coronel Fabriciano Municipality of Minas Gerais State, Brazil. The cases occurred in May and June of 2000. During this period there were two deaths among children from an area named Pedreira in a periurban area of this municipality. In a boy who died with clinical manifestations of Brazilian spotted fever, a necropsy revealed the presence of a spotted fever group Rickettsia. The serological results confirm the difficulty in the differential diagnosis of patients with symptoms of rickettsial diseases.

SEROLOGIC EVIDENCE OF INFECTION WITH EHRLICHIAE AND SPOTTED FEVER GROUP RICKETTSIAE AMONG RESIDENTS OF GAG ISLAND, INDONESIA

2003 ◽  
Vol 68 (4) ◽  
pp. 480-484 ◽  
Author(s):  
ALLEN L. RICHARDS ◽  
EKO RAHARDJO ◽  
DARYL J. KELLY ◽  
GREGORY A. DASCH ◽  
MICHAEL J. BANGS ◽  
...  
Keyword(s):  
Spotted Fever ◽  
Spotted Fever Group ◽  
Spotted Fever Group Rickettsiae ◽  
Serologic Evidence
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