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GenWay/Giardia lamblia antigen in stool (Giardiasis)/GWB-7469BE/1x96 Assays
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4000-520-616
Description:
| ProductName | GiardialambliaAntigen-ELISA. |
|---|---|
| #ofSamples | 1x96Assays. |
| IntendedUse | TheGiardialambliaantigenELISAisintendedforthequalitativedeterminationofGiardialambliaantigensinfaeces. |
| Introduction | Giardialamblia(Lambliaintestinalis)isaflagellatedparasiteaffectingtheintestinaltissueofanimalandmanandisfoundinallpartsoftheworld,especiallyinthetropics.Astrophozoitetheparasiteishighlymotile.Thecystswillbespreadinwaterandthisallowsthetransferfromhosttohost,e.g.withcontaminatedfood,orbysexualtransmission. Thediseasemaymanifestitselfasanacute,chronicorasanasymptomaticinfection.Thefrequencyofinfectionvariesgreatlywiththeregionandisdependentonlocallivingconditions.Localepidemicsaremostlyrelatedtothequalityofwatersupply(contaminationhazard).Infectionoftenproceedswithoutsymptomsorverymild,parasitesmaybeeliminatedspontaneously. Incasesofpersistentinfectionpatientsshowchronicalrecurrentdiarrhoea.Mainlychildrenareaffectedandriskgroupsofimmunodeficientpersons. Giardiaisoneofthemosteasilyrecognizedintestinalprotozoa.Thepresenceofinfectionmaybeidentifiedby Microscopyoftrophozoitesand/orcystsinstool;handlingbyanexperiencedstaffisrecommended. DetectionofcystsortrophozoitesinfaecalspecimensbyELISAorIF DetectionoffaecalantigensbyCIEandELISA. |
| Principlesoftheassay | ThequalitativeimmunoenzymaticdeterminationofGiardialambliaantigensisbasedontheELISA(Enzyme-linkedImmunosorbentAssay)technique. Microtiterstripwellsareprecoatedwithpolyclonalanti-GiardialambliaantibodiestoGiardialambliacystsandtrophozoites.Dilutedpatientspecimen(stool),andreadytousecontrolsareaddedtothesewellsandduringthefirstincubation,Giardiaantigenspresentinthestoolsupernatantarecaptured.AfterwashingthewellstoremoveallunboundsampleandcontrolahorserADIshperoxidaselabelledanti-Giardiaantibodyisaddedwhichbindstothecapturedantigen.Afterincubationandwashingoffunboundenzymetheantigen-conjugate-complexisvisualizedwithTMBsubstratewhichgivesabluereactionproduct,theintensityisproportionaltotheamountofGiardialambliaantigensinthepatientspecimen.Sulphuricacidisaddedtoeachwelltostopthereactionandturnsthebluecolourtoyellow.Absorbanceat450nmisreadusinganELISAreader. |
| StorageandStABIlity | Thereagentsarestableuptotheexpirydatestatedonthelabelwhenstoredat2-8°C.Afterfirstopeningthereagentsarestableforanother2monthsifstoredat+2to+8°C. |
| LimitationsoftheTest | Thereisnocorrelationbetweenthemeasuredabsorbanceandtheseverityofthediseaseandtheabsorbancesofsamplesshouldntbecorrelatedtotheabsorbancesofthetestcontrols.Cross-contaminationofreagentsandsamplescanproducefalseresults.Incorrectdilutions,notsufficientlyhomogenizedsamplesandsamples,whichstayedforsedimentationformorethan10minutescancausefalseresults.Dilutedsamples,whichstayedformorethan10minutesshouldbemixedagainbeforetesting.FermentedsampleswithpHvaluesbelow5afterresUSPensionmayproducefalsenegativeresults.Bacterialcontaminationorrepeatedfreeze-thawcyclesofthespecimenmayaffecttheabsorbancevalues. AnegativeELISAresultdoesnotexcludeaGiardialambliainfection,becausetheexcretionofcystsisperiodic.Thusatleastonefurtherstoolspecimenoftheregardingpersonshouldbedemandedincaseofanegativetestresultbutclinicalsuspect. Diagnosisofaninfectiousdiseaseshouldnotbeestablishedonthebasisofasingletestresult.Aprecisediagnosisshouldtakeintoconsiderationclinicalhistory,symptomatologyaswellasSEROlogicaldata. |
| References | Murray,P.R.(ChiefEditor):ManualofClinicalMicroBIOLOGy.ASMPress,WashingtonD.C.SixthEdition1995Wolfe,M.S.(1990):Giardiasis(Review).ClinicalMicrobiologyReviews5(1),93-100Faubert,G.(2000):ImmuneResponsetoGiardiaduodenalis.ClinicalMicrobiologyReviews13(1),35-54Janoff,E.N.etal.(1992):DiagnosisofGiardialambliaInfectionsbyDetectionofParasiteSpecificAntigens.JournalofClinicalMicrobiology27,431-435 |
AdditionalInformation:
| Name | Giardialambliaantigeninstool(Giardiasis) |
|---|---|
| RelatedProductNames | GiardialambliaAntigen-ELISA |
| MolecularWeight | 0.5 |
| Storage | Thereagentsarestableuptotheexpirydatestatedonthelabelwhenstoredat2...8°C.Afterfirstopeningthereagentsarestableforanother2monthsifstoredat+2to+8°C. |
| IntendedUse | ResearchUseOnly |

