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Three new laboratory tests are currently available for the identification of Pseudomonas aeruginosa isolated from clinical specimens. None of these procedures are specific for P. aeruginosa and cannot be used to differentiate between species within the genus. However, since P. aeruginosa is the only known human pathogen it is the only member of this genus that usually will be encountered in clinical specimens. All three tests are based on the oxidative characteristics of the organisms. Haynes (1951) suggested

Since 1860, when Fordos published his experimental observations concerning the blue-green stain that sometimes appeared on surgical dressings, numerous articles dealing with the organisms commonly assigned to the species Pseudomonas aeruginosa have appeared in the literature. Because of its wide and 'This paper represents a portion of the dissertation to be submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy, St. Louis University. 2The work described in this paper was done under a contract, recommended by the Committee on Medical Research, between the Office of Scientific Research and Development and the St. Louis University.