Cost-Effectiveness of Blood Agar for Isolation of Mycobacteria
Identifieur interne : 001275 ( Main/Exploration ); précédent : 001274; suivant : 001276Cost-Effectiveness of Blood Agar for Isolation of Mycobacteria
Auteurs : Michel Drancourt [France] ; Didier Raoult [France]Source :
- PLoS Neglected Tropical Diseases [ 1935-2727 ] ; 2007.
Abstract
We examined the growth of 41 different
Url:
DOI: 10.1371/journal.pntd.0000083
PubMed: 18060087
PubMed Central: 2100370
Affiliations:
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Cost-Effectiveness of Blood Agar for Isolation of Mycobacteria</title>
<author><name sortKey="Drancourt, Michel" sort="Drancourt, Michel" uniqKey="Drancourt M" first="Michel" last="Drancourt">Michel Drancourt</name>
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<country xml:lang="fr">France</country>
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<author><name sortKey="Raoult, Didier" sort="Raoult, Didier" uniqKey="Raoult D" first="Didier" last="Raoult">Didier Raoult</name>
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<country xml:lang="fr">France</country>
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<series><title level="j">PLoS Neglected Tropical Diseases</title>
<idno type="ISSN">1935-2727</idno>
<idno type="e-ISSN">1935-2735</idno>
<imprint><date when="2007">2007</date>
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<front><div type="abstract" xml:lang="en"><sec><title>Background</title>
<p><italic>Mycobacterium</italic>
species are grown using specific media that increase laboratory cost, thus hampering their diffusion in resource-limited countries. Preliminary data suggested that versatile blood agar may be also used for mycobacterial culture.</p>
</sec>
<sec><title>Methodology</title>
<p>We examined the growth of 41 different <italic>Mycobacterium</italic>
species on 5% blood agar. Over a 24-month period we analysed isolation of mycobacteria after parallel inoculation of clinical specimens into both a reference automated system (BACTEC 9000 MB broth) and 5% blood agar slant tubes, after NaOH decontamination, and compared the cost of performing 1,000 analyses using these two techniques.</p>
</sec>
<sec><title>Conclusions</title>
<p><italic>Mycobacterium</italic>
reference species cultured on blood agar, with the exception of <italic>Mycobacterium ulcerans</italic>
. Inoculation of 1,634 specimens yielded 95 <italic>Mycobacterium</italic>
isolates. Blood agar performed significantly more efficiently than BACTEC 9000 MB broth (94 vs 88 isolates, <italic>P</italic>
= 0.03). Decontamination of <italic>Candida albicans</italic>
in 5 specimens by addition of amphotericin B in blood agar yielded one more <italic>M. tuberculosis</italic>
isolate that could not be isolated in BACTEC broth. Uneven distribution of time to culture positivity for <italic>M. tuberculosis</italic>
had a median (range) of 19±5 days using blood agar and 26±6 days using BACTEC 9000 MB broth. Cost for 1,000 analyses in France was estimated to be of 1,913 euros using the blood agar method and 8,990 euros using the BACTEC 9000 MB method. Blood agar should be regarded as a first-line medium for culturing <italic>Mycobacterium</italic>
species. It saves time, is cost-effective, is more sensitive than, and at least as rapid as the automated method. This is of particular importance for resource-limited countries in which the prevalence of tuberculosis is high.</p>
</sec>
</div>
</front>
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