Thirty-five strains of Pseudomonas cepacia Burkholder, isolated over the last 6 years, were compared with three EO-1 strains, two strains of Stanier et al., and the type strains of and Jonsson, the name of the latter having been given to the EO-1 group. The strains were examined in a range of morphological, biochemical, and carbon substrate utilization tests, and, for selected strains, by electron microscopy, deoxyribonucleic acid base composition, serotyping, and phage typing. From the results of these tests, Jonsson 1970 (EO-1 group) is considered a later subjective synonym of Burkholder 1950 (). The outstanding property of is its nutritional versatility, which is reflected in the large number of carbohydrates from which acid is produced by this organism. A table is given for differentiating from , and


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