Chomarat M, Fredenucci I, Barbé G, Boucaud-Maitre Y, Boyer M, Carricajo A, Célard M, Clergeau P, Croizé J, Delubac F, Fèvre D, Fuhrmann C, Gilles Y, Gravagna B, Helfre M, Letouzey MN, Lelièvre H, Mandjee A, Marchal MF, Marthelet P, Meley R, Perrier-Gros-Claude JD, Bercion R, Reverdy ME, Ros A, Roure C, Sabot O, Smati S, Thierry J, Tixier A, Tous J, Verger P, Zaoui E. [Evaluation of the E-test and the ATB-PNEUMo battery for determining the beta-lactam MIC for Streptococcus pneumoniae in daily practice].
PATHOLOGIE-BIOLOGIE 2001;
49:548-52. [PMID:
11642017 DOI:
10.1016/s0369-8114(01)00207-3]
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Abstract
In 1999, during the survey of resistance of Streptococcus pneumoniae to antibiotics by 31 clinical laboratories of Rhône-Alpes area, MIC to penicillin (P), amoxicillin (AMX) and cefotaxime (CTX) of 877 PRP strains or with a diameter of inhibition to oxacillin inferior to 26 mm, were determined by each institution by E-test (n = 220 strains) or ATB-PNEUMO (n = 657 strains). MICs of these three antibiotics were determined by dilution in agar medium by the coordinating center. The essential agreement was respectively for ATB-PNEUMO and E-test 89% versus 84% for P (p > 0.05), of 86% vs 79% for AMX (p < 0.01), and of 91% vs 86% for CTX (p = 0.03). When the strains were classified in clinical category, the differences were significant (p < 0.001) for AMX (85% vs 71%) and for CTX (82% vs 75%) but not for P (73% vs 78%). ATB-PNEUMO method was more sensitive than E-test for the detection of strains susceptible to P (90 vs 73%), to AMX (83 vs 78%) and to CTX (80 vs 72%) and for the strains intermediate to AMX (90 vs 78%). On the contrary, E-test is more specific than ATB-PNEUMO for the detection of P-resistant strains (94 vs 86%). Finally, the specificity of both methods is the same for detection of P-S, AMX-R and CTX-I strains.
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