2018
DOI: 10.1590/1678-4162-9081 View full text |Buy / Rent full text
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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.… Show more

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“…In accordance with a prior study on BSF outbreaks in urban areas (Poubel et al, 2018), sex and age were not relevant in anti-R. rickettsii seroreactivity in our study ( Table 1). Other studies have shown that the frequency of IFA reactivity was higher among adult dogs than puppies (Cordeiro et al, 2015;Campos et al, 2017).…”
Section: Variablesupporting
“…For example, Gazeta et al (2009) found a 58.7% reactivity rate against R. rickettsii in dogs from rural areas of southern Rio de Janeiro, and Poubel et al 2018found a 67.6% reactivity rate against R. rickettsii in urban dogs of northwestern Rio de Janeiro. Although both our study and that of Poubel et al (2018) were carried out in urban regions, these studies differ epidemiologically. The latter was performed during a human outbreak of BSF, accounting for the markedly high presence of seroreactive dogs.…”
Section: Resultsmentioning
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“…Based on the presence of antibodies (exposure), dogs have been recognized as sentinels for BSF, presenting strong serological evidence of bacterial circulation (Poubel et al, 2018); however, the molecular detection of R. rickettsii in dogs' blood samples is still considered very rare. The discrepancy between the amount of serological and molecular studies, in which dogs show the presence of rickettsial DNA in the bloodstream (rickettsemia), may be related to the fact that bacteria circulate in the blood for a brief period before they invade endothelial cells, or after being released back into the blood due to the disruption of infected cells.…”
Section: Discussionmentioning