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An Electroporation Method to Transform Rickettsia spp. with a Fluorescent Protein-Expressing Shuttle Vector in Tick Cell Lines
Published on: October 11, 2022
Rickettsia parkeri in Brazil
Iara Silveira1, Richard C Pacheco, Matias P J Szabó
1University of São Paulo, São Paulo, Brazil.
Emerging Infectious Diseases
|January 25, 2008
Summary
Rickettsia parkeri bacteria were found in Brazil in nearly 10% of Amblyomma triste ticks. Researchers successfully cultured the bacteria and performed molecular characterization using gene sequencing.
Area of Science:
- Veterinary Entomology
- Microbiology
- Infectious Diseases
Background:
- Rickettsia parkeri is an emerging infectious agent transmitted by ticks.
- The presence and prevalence of R. parkeri in Brazil, particularly in relation to Amblyomma triste ticks, require further investigation.
Purpose of the Study:
- To detect Rickettsia parkeri in Amblyomma triste ticks collected in Brazil.
- To isolate and molecularly characterize R. parkeri found in this region.
Main Methods:
- Tick collection and identification.
- DNA extraction from ticks.
- Polymerase chain reaction (PCR) for Rickettsia detection.
- Bacterial isolation in Vero cell culture.
- DNA sequencing of gltA, htrA, ompA, and ompB genes.
Main Results:
- Rickettsia parkeri was identified in 9.7% of the examined Amblyomma triste ticks.
- An isolate of R. parkeri was successfully cultured in Vero cells.
- Molecular sequencing confirmed the identity of the R. parkeri isolate.
Conclusions:
- This study confirms the presence of Rickettsia parkeri in Amblyomma triste ticks in Brazil.
- The findings highlight the potential role of these ticks in the transmission cycle of R. parkeri in the region.
- Further research is needed to assess the public health implications of R. parkeri in Brazil.
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