Development of three quantitative real-time PCR assays for the detection of Rickettsia raoultii, Rickettsia slovaca, and Rickettsia aeschlimannii and their validation with ticks from the country of Georgia and the Republic of Azerbaijan
| Autor: | Allen L. Richards, Tamasin Yarina, Ju Jiang, Stephen C. Francesconi, Maka Kokhreidze, Tinatin Onashvili, Afrail Ismayilov, Monica L. O'Guinn, Nizam Muttalibov, Marina Donduashvili, Anisha Apte, Ketevan Sidamonidze, Brian J. You, Nikoloz Tsertsvadze, Nigar Agayev, Todd E. Myers, Nino Vephkhvadze, John S. Lee, Evan Liu, Giorgi Babuadze, Mubariz Aliyev |
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| Rok vydání: | 2012 |
| Předmět: |
DNA
Bacterial Azerbaijan Tick Real-Time Polymerase Chain Reaction Georgia (Republic) Sensitivity and Specificity Microbiology law.invention law TaqMan Animals Humans Rickettsia Polymerase chain reaction Dermacentor biology Rickettsia Infections bacterial infections and mycoses biology.organism_classification Virology Spotted fever Infectious Diseases Real-time polymerase chain reaction Insect Science Parasitology Oligonucleotide Probes Hyalomma Bacterial Outer Membrane Proteins |
| Zdroj: | Ticks and Tick-borne Diseases. 3:327-331 |
| ISSN: | 1877-959X |
| DOI: | 10.1016/j.ttbdis.2012.10.004 |
| Popis: | A previous surveillance study of human pathogens within ticks collected in the country of Georgia showed a relatively high infection rate for Rickettsia raoultii, R. slovaca, and R. aeschlimannii. These 3 spotted fever group rickettsiae are human pathogens: R. raoultii and R. slovaca cause tick-borne lymphadenopathy (TIBOLA), and R. aeschlimannii causes an infection characterized by fever and maculopapular rash. Three quantitative real-time polymerase chain reaction (qPCR) assays, Rraoul, Rslov, and Raesch were developed and optimized to detect R. raoultii, R. slovaca, and R. aeschlimannii, respectively, by targeting fragments of the outer membrane protein B gene (ompB) using species-specific molecular beacon or TaqMan probes. The 3 qPCR assays showed 100% specificity when tested against a rickettsiae DNA panel (n=20) and a bacteria DNA panel (n=12). The limit of detection was found to be at least 3 copies per reaction for all assays. Validation of the assays using previously investigated tick nucleic acid preparations, which included Rickettsia-free tick samples, tick samples that contain R. raoultii, R. slovaca, R. aeschlimannii, and other Rickettsia spp., gave 100% sensitivity for all 3 qPCR assays. In addition, a total of 65 tick nucleic acid preparations (representing 259 individual ticks) collected from the country of Georgia and the Republic of Azerbaijan in 2009 was tested using the 3 qPCR assays. R. raoultii, R. slovaca, and R. aeschlimannii were not detected in any ticks (n=31) from the Republic of Azerbaijan, but in the ticks from the country of Georgia (n=228) the minimal infection rate for R. raoultii and R. slovaca in Dermacentor marginatus was 10% and 4%, respectively, and for R. aeschlimannii in Haemaphysalis sulcata and Hyalomma spp. it was 1.9% and 20%, respectively. |
| Databáze: | OpenAIRE |
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