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JAMA. 1950;142(17):1361-1362. doi:10.1001/jama.1950.72910350005010b.
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In the past ten years the reports on external otitis have shown a growing realization of the role of Bacillus pyocyaneus (Pseudomonas aeruginosa) as a pathogen. Probably the earliest expression of this was by Morley1 in 1938. Since that time, many others have been of the same opinion. Salven and Lewis2 investigated 100 consecutive cases of external otitis. B. pyocyaneus was present in 45 per cent of these, whereas in a control group of 25 normal ears none had B. pyocyaneus or fungi. Beach and Hamilton3 in a study of 69 cases of external otitis found B. pyocyaneus in 65 of them. Their control group of 50 normal ears did not show this organism. In a paper on fungous disease of the auditory canal Conley4 stated that he found B. pyocyaneus in two thirds of the cases and concluded that these organisms, rather than fungi, should


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