Abstract
THE ARIZONA group of organisms are gram-negative bacilli which resemble the Salmonella biochemically and serologically. 1,2 Biochemical differentiation from Salmonella is based on the ability of Arizona group to liquefy gelatin (delayed), ferment lactose (rapid or delayed), ferment malonate, and inability to ferment D-tartrate or dulcitol. Like Salmonella, Arizona possesses O and H antigens, which may be monophasic or diphasic. Edwards and Ewing have differentiated 33 O groups and 241 serotypes from cultures collected and isolated from numerous sources over a period of 20 years. 3 Although Edwards et al published an excellent review of the microbiological aspects of Arizona group in 1959, 1 it has not been generally appreciated that these organisms can produce serious, though fortunately uncommon, infections in man. The purpose of this paper is to present a patient with localized Arizona infection who recovered, and who was treated with antibiotics, based upon the results of tube-dilution
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