Diagnostic accuracy of an in-house Scrub Typhus enzyme ... | scrub typhus igm positive means

ResultsArticleAuthorsMetricsCommentsMediaCoverageReaderComments(0)FiguresFiguresAbstractScrubtyphusisamajorcauseofmorbidityandmortalityinSoutheastAsia.Diagnosisofscrubtyphusisdifficultduetoalackofaccessiblevalidateddiagnostictools.Despiteitsobjectivity,thediagnosticaccuracyofELISAtestsisinfluencedbymethodologicalandpatientfactors.Thisstudyaimstoevaluatetheperformanceofanovelin-houseELISAdevelopedintheMahidolOxfordTropicalMedicineResearchUnit(MORU)foranti-scrubtyphusgroupIgMandIgGcomparedtothe“goldstandard”referenceIFAandPCR,andtodeterminewhetherthein-houseELISAcanbeusedasaseroepidemiologicalscreeningtooland/orstand-alonetestforscrubtyphus.Atotalof1,976admissionand1,438participantfollow-upseracollectedintheLaoPDR(Laos)weretestedwithELISAforIgMandIgG.SampleswithanELISAOD≥0.50weretestedwithIFAforIgMand/orIgG.AstrongpositiverelationshipwaspresentbetweenELISAODsandIFAtitersforadmissionIgM(r2:0.70,p<0.005)andIgG(r2:0.76,p<0.005),andforfollow-upIgMandIgG(bothr2:0.76,p<0.005)samples.ThebestcompromisebetweensensitivityandspecificityfortheELISAODcut-offislikelytobebetween0.8–1.0forIgMantibodiesand1.2–1.8forIgGantibodies.TheseresultsdemonstratethatthediagnosticaccuracyoftheMORUin-housescrubtyphusgroupELISAiscomparabletothatofIFA,withsimilarresultsasreportedforthecommonlyusedInBiosScrubTyphusDetectELISA,validatingtheuseofthein-houseELISA.TheoptimalELISAcut-offwoulddependontheuseofthetest,andthedesiredsensitivityandspecificity.Furtherstudiesarerequiredtoauthenticatetheuseofthesecut-offsinotherendemicregions.Thisin-houseELISAhasthepotentialtoreplacetheimperfectIFA,whichcouldultimatelyreducetheburdenofscrubtyphusbyimprovingtherateofscrubtyphusdiagnosesinendemiclow-resourceareas.AuthorsummaryScrubtyphusisamite-borneinfectiousdisease,causedbytheOrientiatsutsugamushibacterium,resultinginconsiderablemorbidityandmortalityintheAsia-Pacificregion.Diagnosisisdifficultsinceitdoesnotpresentwithanydistinctiveclinicalsignscomparedtootherfebrileillnessesinthisregion,exceptforanecroticskinlesio


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