Kawakami Y, Akahane T, Gotoh A, Okimura Y, Oana K, Katsuyama T. Successful development of air-dried microplates (HP-Plates) for susceptibility testing against Helicobacter pylori isolates.
Microbiol Immunol 1997;
41:703-8. [PMID:
9343821 DOI:
10.1111/j.1348-0421.1997.tb01914.x]
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Abstract
We have successfully developed and evaluated a new susceptibility testing procedure against Helicobacter pylori strains using air-dried microplates "HP-Plates" containing eight serially-diluted anti-H. pylori agents. HP-Plate wells were reconstituted by the inoculation of 100 microliters of H. pylori cell suspensions. After incubation at 37 C for 48 hr under humidified microaerophilic conditions, HP-Plates were read visually with a circular mirror. We investigated the within-day reproducibility tests of HP-Plates using the six quality control (QC) strains we proposed. Of the 20 testings, determining the minimum inhibitory concentrations (MICs) of all the QC strains fell within +/- 1 log2 dilution ranges. When 200 clinical isolates were tested with HP-Plates and compared with the results obtained with the modified broth macrodilution method of NCCLS, more than 90% of the MICs also fell within +/- 1 log2 dilution ranges. We concluded that the HP-Plate susceptibility test method is a practical and easily applicable alternative of susceptibility testing for clinical microbiology laboratories in determining the MICs of H. pylori isolates.
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