Name: preparation of a blood culture pellet for rapid bacterial identification and antibiotic susceptibility testing
Uploaded: 2014-10-15T14:00:00
Description: Watch this Scientific Journal Video about Preparation of a Blood Culture Pellet for Rapid Bacterial Identification and Antibiotic Susceptibility Testing at JoVE.com

Vi takker teknikerne i bakteriologi laboratorium på University Hospital Center Lausanne for deres hjælp til at gennemføre de teknikker i laboratoriet.

Denne protokol er blevet udviklet og valideret efter forskning og udviklingsprocesser og etiske regler på vores institution før de bliver implementeret som en rutinemæssig værktøj. 1. Fremstilling af en blodkultur bakteriepellet af Ammoniumklorid Erythrocyte-lyserende Procedure <ol><li> Fremstilling af en positiv blod kultur for efterfølgende centrifugering. <ol><li> Steriliser blodkultur hætte. Tilføj 70% ethanol på hætten af ​​flasken og brænde det. BEMÆRK: Du må ...

<ol>
	<li>Alberti, C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Epidemiology+of+sepsis+and+infection+in+ICU+patients+from+an+international+multicentre+cohort+study.">Epidemiology of sepsis and infection in ICU patients from an international multicentre cohort study.</a> Intensive care medicine. 28, 108-121 (2002).</li><li>Angus, D. C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Epidemiology+of+severe+sepsis+in+the+United+States:+analysis+of+incidence,+outcome,+and+associated+costs+of+care.">Epidemiology of severe sepsis in the United States: analysis of incidence, outcome, and associated costs of care.</a> Critical care medicine. 29, 1303-1310 (2001).</li><li>Vincent, J. L., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Sepsis+in+European+intensive+care+units+results+of+the+SOAP+study.">Sepsis in European intensive care units results of the SOAP study.</a> Critical care medicine. 34, 344-353 (2006).</li><li>Micek, S. T., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Empiric+combination+antibiotic+therapy+is+associated+with+improved+outcome+against+sepsis+due+to+Gram-negative+bacteria+a+retrospective+analysis.">Empiric combination antibiotic therapy is associated with improved outcome against sepsis due to Gram-negative bacteria a retrospective analysis.</a> Antimicrob Agents Chemother. 54, 1742-1748 (2010).</li><li>Seifert, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+clinical+importance+of+microbiological+findings+in+the+diagnosis+and+management+of+bloodstream+infections.">The clinical importance of microbiological findings in the diagnosis and management of bloodstream infections.</a> Clin Infect Dis. 48, S238-S245 (2009).</li><li>Barenfanger, J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Decreased+mortality+associated+with+prompt+Gram+staining+of+blood+cultures.">Decreased mortality associated with prompt Gram staining of blood cultures.</a> American journal of clinical pathology. 130, 870-876 (2008).</li><li>Munson, E. L., Diekema, D. J., Beekmann, S. E., Chapin, K. C., Doern, G. V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Detection+and+treatment+of+bloodstream+infection:+laboratory+reporting+and+antimicrobial+management.">Detection and treatment of bloodstream infection: laboratory reporting and antimicrobial management.</a> J Clin Microbiol. 41, 495-497 (2003).</li><li>Clerc, O., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Impact+of+matrix-assisted+laser+desorption+ionization+time-of-flight+mass+spectrometry+on+the+clinical+management+of+patients+with+Gram-negative+bacteremia+a+prospective+observational+study.">Impact of matrix-assisted laser desorption ionization time-of-flight mass spectrometry on the clinical management of patients with Gram-negative bacteremia a prospective observational study.</a> Clin Infect Dis. 56, 1101-1107 (2013).</li><li>Meex, C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Direct+identification+of+bacteria+from+BacT/ALERT+anaerobic+positive+blood+cultures+by+MALDI-TOF+MS+MALDI+Sepsityper+kit+versus+an+in-house+saponin+method+for+bacterial+extraction.">Direct identification of bacteria from BacT/ALERT anaerobic positive blood cultures by MALDI-TOF MS MALDI Sepsityper kit versus an in-house saponin method for bacterial extraction.</a> Journal of medical microbiology. 61, 1511-1516 (2012).</li><li>Moussaoui, W., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Matrix-assisted+laser+desorption+ionization+time-of-flight+mass+spectrometry+identifies+90%+of+bacteria+directly+from+blood+culture+vials.">Matrix-assisted laser desorption ionization time-of-flight mass spectrometry identifies 90% of bacteria directly from blood culture vials.</a> Clin Microbiol Infect. 16, 1631-1638 (2010).</li><li>Seng, P., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ongoing+revolution+in+bacteriology+routine+identification+of+bacteria+by+matrix-assisted+laser+desorption+ionization+time-of-flight+mass+spectrometry.">Ongoing revolution in bacteriology routine identification of bacteria by matrix-assisted laser desorption ionization time-of-flight mass spectrometry.</a> Clin Infect Dis. 49, 543-551 (2009).</li><li>Stevenson, L. G., Drake, S. K., Murray, P. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Rapid+identification+of+bacteria+in+positive+blood+culture+broths+by+matrix-assisted+laser+desorption+ionization-time+of+flight+mass+spectrometry.">Rapid identification of bacteria in positive blood culture broths by matrix-assisted laser desorption ionization-time of flight mass spectrometry.</a> J Clin Microbiol. 48, 444-447 (2010).</li><li>Croxatto, A., Prod&amp;34hom, G., Greub, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Applications+of+MALDI-TOF+mass+spectrometry+in+clinical+diagnostic+microbiology.">Applications of MALDI-TOF mass spectrometry in clinical diagnostic microbiology.</a> FEMS Microbiol Rev. 36, 380-407 (2012).</li><li>Chen, J. H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Direct+bacterial+identification+in+positive+blood+cultures+by+use+of+two+commercial+matrix-assisted+laser+desorption+ionization-time+of+flight+mass+spectrometry+systems.">Direct bacterial identification in positive blood cultures by use of two commercial matrix-assisted laser desorption ionization-time of flight mass spectrometry systems.</a> J Clin Microbiol. 51, 1733-1739 (2013).</li><li>Prod&amp;34hom, G., Bizzini, A., Durussel, C., Bille, J., Greub, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Matrix-assisted+laser+desorption+ionization-time+of+flight+mass+spectrometry+for+direct+bacterial+identification+from+positive+blood+culture+pellets.">Matrix-assisted laser desorption ionization-time of flight mass spectrometry for direct bacterial identification from positive blood culture pellets.</a> J Clin Microbiol. 48, 1481-1483 (2010).</li><li>Prod&amp;34hom, G., Durussel, C., Greub, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+simple+blood-culture+bacterial+pellet+preparation+for+faster+accurate+direct+bacterial+identification+and+antibiotic+susceptibility+testing+with+the+VITEK+2+system.">A simple blood-culture bacterial pellet preparation for faster accurate direct bacterial identification and antibiotic susceptibility testing with the VITEK 2 system.</a> Journal of medical microbiology. 62, 773-777 (2013).</li><li>Clerc, O., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Matrix-assisted+laser+desorption+ionization+time-of-flight+mass+spectrometry+and+PCR-based+rapid+diagnosis+of+Staphylococcus+aureus+bacteraemia.">Matrix-assisted laser desorption ionization time-of-flight mass spectrometry and PCR-based rapid diagnosis of Staphylococcus aureus bacteraemia.</a> Clin Microbiol Infect. , (2013).</li><li>Martiny, D., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Impact+of+rapid+microbial+identification+directly+from+positive+blood+cultures+using+matrix-assisted+laser+desorption/ionization+time-of-flight+mass+spectrometry+on+patient+management.">Impact of rapid microbial identification directly from positive blood cultures using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry on patient management.</a> Clin Microbiol Infect. 19, E568-E581 (2013).</li><li>Stoneking, L. R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Would+earlier+microbe+identification+alter+antibiotic+therapy+in+bacteremic+emergency+department+patients.">Would earlier microbe identification alter antibiotic therapy in bacteremic emergency department patients.</a> The Journal of emergency medicine. 44, 1-8 (2013).</li><li>Nordmann, P., Dortet, L., Poirel, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Rapid+detection+of+extended-spectrum-beta-lactamase-producing+Enterobacteriaceae.">Rapid detection of extended-spectrum-beta-lactamase-producing Enterobacteriaceae.</a> J Clin Microbiol. 50, 3016-3022 (2012).</li></ol>

Sammenlignet med konventionelle positiv blod kultur diagnostiske metoder, den hurtige overtagelse af en bakteriel pille ved hjælp af ammoniumchlorid lyse centrifugering tilgang reducere den tid til at rapportere identifikation af 16 til 24 timer, og tiden til at rapportere AST ved 24 til 48 timer (figur 1 og 3). Hurtig indførelse af passende antibiotikabehandling er afgørende at forbedre resultatet af patienter, der lider af infektioner i blodbanen. Således tidlig identi...

Blodbanen infektioner og sepsis hos indlagte patienter er en væsentlig årsag til sygelighed og dødelighed. Således er observeret dødelighed relateret til infektioner i blodet på omkring 14% til 37% af indlagte patient og kan stige til 35% i intensivafdelinger patienter 1-3. Hurtig identifikation af smitstoffet er afgørende at vejlede optimal antimikrobiel behandling og øge det vellykkede resultat af antimikrobiel terapi 4,5. Den hurtige analyse af Gram pletter fra positiv blod kultur har allerede en betydelig indvirkning på tilpasningen af antimikrobiel behandling 6,7 men præcis identifikation af smitstoffet er forpligtet til at yde den bedst tilpassede antibiotisk behandling til patienterne. For eksempel forskellige antibiotika behandlingsregimer skal gennemføres efter bakteriæmi med enterokokker og streptokokker, der er vanskelige at skelne fra Gram farvning. Ligeledes identifikation på de arter Level er påkrævet for at detektere gramnegative enterobakterier koder for et kromosomalt AMPC gen, som giver en forøget resistens over for β-lactamer 8. Med en positiv blod kultur, den konventionelle diagnostiske metode er at videredyrke smitstoffet på forskellige agarplader, der kræver flere timers ekstra inkubation forudgående identifikation med forskellige tilgange, herunder biokemiske tests, vækst på forskellige selektive medier og automatiserede mikrobielle identifikationssystemer. Tiden til resultaterne af en konventionel diagnostisk fremgangsmåde er på omkring 1 til 3 dage. Fremkomsten af ​​matrix-assisteret laser desorption / ionisering tid-of-flight massespektrometri (MALDI-TOF)-teknologi til hurtig identifikation af mikroorganismer har givet et nyt redskab til hurtigt at identificere mikroorganismer fra kolonier dyrket på agarplader, men også direkte fra positiv blod kulturer (figur 1) 9-12. The brug af MALDI-TOF at identificere et smitstof fra blodkulturer har reduceret tid til resultaterne til et par minutter i stedet for de timer og dage, der kræves ved traditionelle metoder. Som diskuteret af Croxatto et al. 13 effektiviteten af MALDI-TOF-identifikation bygger på forskellige parametre, herunder mikroorganismen renhed og mængde. Disse to kriterier er nemt fås fra diskrete kolonier dyrket på agarplader, men krævede en præ-analytisk behandling for bakteriel berigelse og oprensning fra komplekse prøver såsom blod kultur, som indeholder flere cellulære og protein komponenter, der kan interferere med MALDI-TOF identifikation. Forskellige mikroorganismer isolation metoder fra blod kultur er blevet brugt i en række undersøgelser, herunder saponin eller andre milde rengøringsmidler metode til bakteriel ekstraktion 9,14, serum separator metode 10 Lysis centrifugering metoder 12 </sop&gt; og kommercielt løsninger som den sepsityper kit. Vores bakteriologi diagnostisk laboratorium har udviklet en simpel blod-kultur bakteriepellet forberedelse baseret på ammoniumchlorid erythrocyt-lyse, som gør det muligt hurtigt at identificere bakterier og gær ved MALDI-TOF og automatiserede identifikationssystemer (figur 2) 15. Dette blod-kultur pille præparat også give en prøve til andre direkte downstream-applikationer såsom Gram-farvning, automatiserede PCR-baserede diagnostiske tests såsom POCT-PCR til hurtig påvisning af methicillin-resistente Staphyloccocus aureus (MRSA), og antibiotikaresistens undersøgelserne med automatiserede AST og / eller ved disk diffusion assays på agarplader (Figur 3). I dette arbejde har vi beskrive de forskellige trin til fremstilling af blod-kultur bakteriepellet som forklaret af Prod&#39;hom et al. 15 (figur 4). Vi vil også deskriftlærde protokollerne for tre af de vigtigste programmer, der kan udføres på blod kultur pille: Identifikation ved MALDI-TOF 15, identifikation (ID), og antibiotisk følsomhedstestning (AST) med de automatiserede systemer 16 for enterobakterier og stafylokokker og automatiseret PCR- baseret diagnostisk test til påvisning af MRSA 17.

<table border="0" cellpadding="0" cellspacing="0" width="1130">
	<tbody>
		<tr height="20">
			<td height="20" style="height:20px;width:268px;">20 needle gauge&#160;</td>
			<td style="width:268px;">Terumo, Leuven, Belgium</td>
			<td style="width:239px;">NN-2038R</td>
			<td style="width:355px;"></td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">50 ml Falcon tube</td>
			<td>BD, Franklin Lakes, NJ, USA</td>
			<td>352070</td>
			<td>50 ml centrifuge tubes</td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">Ammonium chlorure</td>
			<td>Merck, Darmstadt, Germany</td>
			<td>101145</td>
			<td></td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">Potassium hydrogen carbonate</td>
			<td>Fluka, St. Louis, MO, USA&#160;</td>
			<td>60340</td>
			<td></td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">Formic acid</td>
			<td>Sigma-Aldrich, St. Louis, MO, USA&#160;</td>
			<td>F0507</td>
			<td>Flammable, corrosive</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">a-Cyano-4-hydroxycinnamic acid</td>
			<td>Fluka, St. Louis, MO, USA&#160;</td>
			<td>70990</td>
			<td>Acute toxicity</td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">Acetonitrile</td>
			<td>Sigma-Aldrich, St. Louis, MO, USA&#160;</td>
			<td>271004</td>
			<td>Flammable, acute toxicity</td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">Trifluoroacetic acid</td>
			<td>Sigma-Aldrich, St. Louis, MO, USA&#160;</td>
			<td>T6508</td>
			<td>Corrosive, acute toxicity</td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">Vitek 2 60 instrument</td>
			<td>Biom&#233;rieux, Marcy-l&#39;Etoile, France</td>
			<td>27202</td>
			<td>automated microbial system instrument</td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">Vitek 2 Gram-positive (GP) card</td>
			<td>Biom&#233;rieux, Marcy-l&#39;Etoile, France</td>
			<td>21342</td>
			<td>automated GP&#160; identification card</td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">Vitek 2 AST-P580 card</td>
			<td>Biom&#233;rieux, Marcy-l&#39;Etoile, France</td>
			<td>22233</td>
			<td>automated microbial AST system</td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">Vitek 2 Gram-negative (GN) card</td>
			<td>Biom&#233;rieux, Marcy-l&#39;Etoile, France</td>
			<td>21341</td>
			<td>automated GN&#160; identification card</td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">Vitek 2 AST-N242 card</td>
			<td>Biom&#233;rieux, Marcy-l&#39;Etoile, France</td>
			<td>413391</td>
			<td>automated microbial AST system</td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">Xpert MRSA</td>
			<td>Cepheid, Sunnyvale, Ca, USA</td>
			<td>&#160;GXMRSA-100N-10</td>
			<td>nucleic acid amplification technology MRSA</td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">GeneXpert IV instrument</td>
			<td>Cepheid, Sunnyvale, Ca, USA</td>
			<td>GXIV-4-D</td>
			<td>nucleic acid amplification technology instrument</td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">Microflex LT MALDI-TOF MS instrument</td>
			<td>Bruker Daltonics, Bremen, Germany</td>
			<td>BDAL microflex LT/SH</td>
			<td></td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">MSP 96 target&#160; steel BC</td>
			<td>Bruker Daltonics, Bremen, Germany</td>
			<td>280799</td>
			<td>MALDI target plate</td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">Densitometer Densicheck instrument</td>
			<td>Biom&#233;rieux, Marcy-l&#39;Etoile, France</td>
			<td>27208</td>
			<td></td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">MALDI Sepsityper kit 50</td>
			<td>Bruker Daltonics, Bremen, Germany</td>
			<td>8270170</td>
			<td></td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">Mac Conkey agar</td>
			<td>Biolife, Milano, Italy</td>
			<td>4016702</td>
			<td></td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">Mueller-Hinton agar</td>
			<td>Oxoid, Hampshire, England</td>
			<td>CM0337</td>
			<td>Mueller-Hinton agar (MH)&#160;</td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">MHF agar</td>
			<td>Biom&#233;rieux, Marcy-l&#39;Etoile, France</td>
			<td>43901</td>
			<td>Mueller-Hinton agar-fastidious organisms agar (MHF)</td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">BD columbia III agar</td>
			<td>BD, Franklin Lakes, NJ, USA</td>
			<td>254071</td>
			<td>blood agar</td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">BD chocolate agar</td>
			<td>BD, Franklin Lakes, NJ, USA</td>
			<td>254089</td>
			<td>chocolate agar</td>
		</tr>
		<tr height="19">
			<td height="19" style="height:19px;">BD schaedler agar</td>
			<td>BD, Franklin Lakes, NJ, USA</td>
			<td>254084</td>
			<td>Schaedler agar</td>
		</tr>
	</tbody>
</table>

preparation of a blood culture pellet for rapid bacterial identification and antibiotic susceptibility testing

Blodbanen infektioner og sepsis er en væsentlig årsag til sygelighed og dødelighed. Det vellykkede resultat af patienter med bakteriæmi afhænger af en hurtig identifikation af smitstoffet at vejlede en optimal behandling med antibiotika. Hurtigt kan udføres analyse af Gram pletter fra positiv blod kultur og allerede påvirke den antibiotiske regime betydeligt. Men den nøjagtige identifikation af det infektiøse agens stadig forpligtet til at etablere den optimale målrettet behandling. Vi præsenterer her en enkel og hurtig bakteriel forberedelse pellet fra en positiv blod kultur, der kan anvendes som en prøve til flere vigtige downstream-applikationer, såsom identifikation af MALDI-TOF MS, antibiotika resistensbestemmelse (AST) af disk diffusion assay eller automatiserede AST systemer og ved automatiseret PCR-baseret diagnostisk test. Udførelsen af ​​disse forskellige identifikationsnumre og AST, der anvendes direkte på blodkultur bakterielle piller er meget siMilar udførelsen normalt udvindes af isolerede kolonier dyrket på agarplader. Sammenlignet med konventionelle metoder, den hurtige overtagelse af en bakteriel pille reducerer den tid til at rapportere både identifikation og AST betydeligt. Således kan følgende blod kultur positivitet, identifikation af MALDI-TOF indberettes inden for mindre end 1 time hvorimod resultaterne af AST fra automatiske AST systemer eller disk diffusion analyser inden for 8 til 18 timer, hhv. Ligeledes kan resultaterne af en hurtig PCR-baseret analyse meddeles de klinikere mindre end 2 timer efter rapporten fra en bakteriæmi. Tilsammen viser disse resultater, at en hurtig udarbejdelse af en blod kultur bakteriepellet har en betydelig indvirkning på identifikation og AST ekspeditionstid og dermed på det vellykkede resultat af patienter, der lider infektioner i blodbanen.

I udføres af Prod&#39;hom et al. 15 undersøgelse blev bakterielle opnåede pellets af ammoniumchlorid lysis centrifugering af 122 positivt blod kultur fra 78 patienter analyseret ved MALDI-TOF-MS. Ud af 122 positiv blod kultur, blev 95 (77,9%) korrekt identificeret på artsniveau og én (0,8%) ved slægten niveau. De resterende 26 (21,3%) blod kultur piller gav ingen pålidelig identifikation af MALDI-TOF. Blandt dem var 21 gram-positive bakterier, herunder 13 streptokokker og 5 koagulase-negative ...

Watch this Scientific Journal Video about Preparation of a Blood Culture Pellet for Rapid Bacterial Identification and Antibiotic Susceptibility Testing at JoVE.com

Preparation of a Blood Culture Pellet for Rapid Bacterial Identification and Antibiotic Susceptibility Testing

En hurtig bakteriel præparat pellet fra en positiv blod kultur kan anvendes som en prøve til applikationer, såsom identifikation af MALDI-TOF, Gram farvning, antibiotisk følsomhedstest og PCR-baserede test. Resultaterne kan hurtigt meddeles klinikere at forbedre resultatet af patienter med blodforgiftning.

Fremstilling af en blodkultur Pellet til hurtig bakteriel identifikation og antibiotikaresistens undersøgelserne

Bloodstream infections and sepsis are a major cause of morbidity and mortality. The successful outcome of patients suffering from bacteremia depends on a ...

Research

JoVE Journal

Immunology and Infection

A 96 Well Microtiter Plate-based Method for Monitoring Formation and Antifungal Susceptibility Testing of Candida albicans Biofilms

A 96 Well Microtiter Plate-based Method for Monitoring Formation and Antifungal Susceptibility Testing of Candida albicans Biofilms

Candida albicans remains the most frequent cause of fungal infections in an expanding population of compromised patients and candidiasis is now the third ...

Protocol for Recombinant RBD-based SARS Vaccines: Protein Preparation, Animal Vaccination and Neutralization Detection

Based on their safety profile and ability to induce potent immune responses against infections, subunit vaccines have been used as candidates for a wide ...

A 1.5 Hour Procedure for Identification of Enterococcus Species Directly from Blood Cultures

A 1.5 Hour Procedure for Identification of Enterococcus Species Directly from Blood Cultures

Enterococci are a common cause of bacteremia with E. faecalis being the predominant species followed by E. faecium.  Because resistance to ampicillin and ...

Antimicrobial Susceptibility Testing of Mycobacterium Tuberculosis Complex for First and Second Line Drugs by Broth Dilution in a Microtiter Plate Format

The rapid detection of antimicrobial resistance is important in the effort to control the increase in resistant Mycobacterium 
tuberculosis (Mtb). ...

Introducing Shear Stress in the Study of Bacterial Adhesion

During bacterial infections a sequence of interactions occur between the pathogen and its host. Bacterial adhesion to the host cell surface is often the ...

One-day Workflow Scheme for Bacterial Pathogen Detection and Antimicrobial Resistance Testing from Blood Cultures

En-dags Workflow ordningen for bakteriepatogen Detection og antimikrobiel resistens fra blodkulturer

Bloodstream infections are associated with high mortality rates because of the probable manifestation of sepsis, severe sepsis and septic shock1. ...

Rapid Identification of Gram Negative Bacteria from Blood Culture Broth Using MALDI-TOF Mass Spectrometry

Rapid Identifikation af Gram-negative bakterier fra Blood kulturvæsken Brug MALDI-TOF-massespektrometri

An important role of the clinical microbiology laboratory is to provide rapid identification of bacteria causing bloodstream infection. Traditional ...

A Reference Broth Microdilution Method for Dalbavancin In Vitro Susceptibility Testing of Bacteria that Grow Aerobically

A Reference Broth Microdilution Method for Dalbavancin In Vitro Susceptibility Testing of Bacteria that Grow Aerobically

En reference Broth mikrofortynding Metode til dalbavancin<em&gt; In vitro</em&gt; Resistensbestemmelse af bakterier, der vokser aerobt

Antimicrobial susceptibility testing (AST) is performed to assess the in vitro activity of antimicrobial agents against various bacteria. The AST results, ...

A RAPID Method for Blood Processing to Increase the Yield of Plasma Peptide Levels in Human Blood

En hurtig metode til Blood Processing at øge udbyttet af Plasma-peptid niveauer i Human Blood

Research in the field of food intake regulation is gaining importance. This often includes the measurement of peptides regulating food intake. For the ...

Culture of Macrophage Colony-stimulating Factor Differentiated Human Monocyte-derived Macrophages

Dyrkning af makrofag kolonistimulerende faktor differentierede humane monocytafledte makrofager

A protocol is presented for cell culture of macrophage colony-stimulating factor (M-CSF) differentiated human monocyte-derived macrophages. For initiation ...