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Journal of Clinical Microbiology, August 2007, p. 2474-2479, Vol. 45, No. 8
0095-1137/07/$08.00+0     doi:10.1128/JCM.00089-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Validation and Reproducibility Assessment of Tigecycline MIC Determinations by Etest{triangledown}

Anne Bolmström,1 Åsa Karlsson,1 Anette Engelhardt,1 Phion Ho,1 Peter J. Petersen,2 Patricia A. Bradford,2 and C. Hal Jones2*

AB BIODISK, Solna, Sweden,1 Infectious Diseases Research, Wyeth Research, Pearl River, New York2

Received 12 January 2007/ Returned for modification 22 March 2007/ Accepted 11 May 2007

A multicenter study was conducted to validate Etest tigecycline compared to the Clinical Laboratory Standards Institute reference broth microdilution and agar dilution methodologies. A large collection of gram-negative (n = 266) and gram-positive (n = 162) aerobic bacteria, a collection of anaerobes (n = 385), and selected collections of nonpneumococcal streptococci (n = 369), Streptococcus pneumoniae (n = 372), and Haemophilus influenzae (n = 372) were tested. Strains with reduced susceptibility to tigecycline were used with all test methods. The Etest showed excellent inter- and intralaboratory reproducibility for all organism groups tested regardless of the test methodology. The essential agreement values with the reference method (±1 dilution) were >99% for the collection of gram-negative and gram-positive aerobes; >98% for the S. pneumoniae, H. influenzae, and anaerobe collections; and 100% for the group of nonpneumococcal streptococci. These results validate the performance accuracy and utility of Etest tigecycline and verify the reproducibility of this convenient predefined gradient methodology for tigecycline susceptibility determination.

* Corresponding author. Mailing address: Wyeth Reseaarch, 401 N. Middletown Rd., Bldg. 200, Rm. 3219, Pearl River, NY 10965. Phone: (845) 602-4612. Fax: (845) 602-5671. E-mail: jonesh3{at}wyeth.com

{triangledown} Published ahead of print on 23 May 2007.

Journal of Clinical Microbiology, August 2007, p. 2474-2479, Vol. 45, No. 8
0095-1137/07/$08.00+0     doi:10.1128/JCM.00089-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



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