The use of commercial test-systems has not allowed to identify 11 atypical clinical strains of nonfermenting Gram-negative bacteria. The divergences arised not only under their species identification, but also under generic one. On the basis of studying the fatty acid composition of the cell wall all isolates were referred to Pseudomonas genus. The further control of species belonging of the strains carried out with the use of 45 tests and the computer program www.imv.kiev.ua/PsmIK/default.htm has confirmed, that five isolates are representatives of P. aeruginosa, two ones were identified as P. fluorescens, and three more as Pseudomonas spp.
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