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Chapter 131. Diphtheria and Other Infections Caused by Corynebacteria and Related Species (Part 6)

Microbiology and Laboratory Diagnosis These organisms are non-acid-fast, catalase-positive, aerobic or facultatively anaerobic bacilli. Their colonial morphologies vary widely; some species are small and α-hemolytic (similar to lactobacilli), whereas others form large white colonies (similar to yeasts). Many nondiphtherial coryneforms require special medium (e.g., Löffler's, Tinsdale's, or telluride medium) for growth. Epidemiology Humans are the natural reservoirs for several nondiphtherial coryneforms, including C. xerosis, C. pseudodiphtheriticum, C. striatum, C. minutissimum, C. jeikeium, C. urealyticum, and A. haemolyticum. Animal reservoirs are responsible for carriage of A. pyogenes, C. ulcerans, and C. pseudotuberculosis. Soil is the natural reservoir for R. equi. .