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Jämförelse av Fluidigm-PCR och realtids-PCR vid detektion av Rickettsia spp.: Samt undersökning av risken att drabbas av infektion efter bett av rickettsiainfekterad fästing
Jönköping University, School of Health and Welfare, HHJ, Dep. of Natural Science and Biomedicine.
Jönköping University, School of Health and Welfare, HHJ, Dep. of Natural Science and Biomedicine.
2018 (Swedish)Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesisAlternative title
Comparison between Fluidigm-PCR and real-time PCR for detection of Rickettsia spp. : And evaluation of the risk of getting an infection after being bitten by a tick infected with Rickettsia spp. (English)
Abstract [sv]

Fästingburna infektioner är ett ökande problem, och därmed även infektioner orsakade av Rickettsia spp. Syftet med studien var att undersöka risken att drabbas av en infektion efter bett av rickettsiainfekterad fästing. Specificitet och sensitivitet av Fluidigm-PCR jämfördes mot real time polymerase chain reaction (realtids-PCR) vid detektion av Rickettsia spp. i fästingar som bitit människor. Vidare undersöktes om det finns någon korrelation mellan fästingens blodsugningstid och serokonversion mot Rickettsia spp. 753 fästingar lämnades in av 104 deltagare i Sverige och på Åland. Fästingarna analyserades med realtids-PCR för att detektera gltA-genen som är specifik för Rickettsia spp. 3,5 % av fästingarna var positiva för Rickettsia spp. med realtids-PCR. Vid analysering med Fluidigm-PCR av samma material blev 1,3 % av proverna positiva. Beräkningar som gjordes med realtids-PCR som referens visade att Fluidigm-PCR har sämre specificitet och sensitivitet jämfört med realtids-PCR. Deltagare som serokonverterade (n=5) lämnade endast in rickettsianegativa fästingar som därför inte kunde kopplas till infektionen. Därmed kunde inga slutsatser dras om risken att drabbas av en infektion efter bett av rickettsiainfekterad fästing eller om det föreligger någon korrelation mellan fästingens blodsugningstid och serokonversion.

Abstract [en]

Tick-borne infections are increasing, including infections caused by Rickettsia spp. The aim of this study was to examine the risk of developing an infection after being bitten by a tick infected with Rickettsia spp. Specificity and sensitivity of a Fluidigm-PCR assay were compared to real time polymerase chain reaction (real-time PCR) assay when detecting Rickettsia spp. in ticks that had bitten humans. Possible correlation between the tick's feeding time and seroconversion against Rickettsia spp. was also investigated. A total of 753 ticks from 104 participants in Sweden and the Åland Islands (Finland) were analyzed with real-time PCR to detect the gltA gene specific for Rickettsia spp. 3.5 % of the samples were positive for Rickettsia spp. with real-time PCR, while only 1.3 % of the samples were positive with Fluidigm-PCR. Calculations showed that Fluidigm-PCR assay has lower specificity and sensitivity than the real-time PCR assay. Unfortunately, no conclusions could be drawn considering correlation between the tick's feeding time and seroconversion of the bitten humans since no participants who had seroconverted had also submitted ticks containing Rickettsia spp. Therefore, no conclusions could be drawn considering the risk of developing an infection after being bitten by a tick infected with Rickettsia spp.

Place, publisher, year, edition, pages
2018. , p. 28
Keywords [sv]
Rickettsios, Ixodes ricinus, Rickettsia helvetica, STING-studien, Spotted fever group
National Category
Biomedical Laboratory Science/Technology
Identifiers
URN: urn:nbn:se:hj:diva-40358ISRN: JU-HHJ-BLA-1-20180067OAI: oai:DiVA.org:hj-40358DiVA, id: diva2:1218018
Subject / course
HHJ, Biomedical Laboratory Science
Projects
STING-studienAvailable from: 2018-06-21 Created: 2018-06-13 Last updated: 2018-06-21Bibliographically approved

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