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An increase in the number of isolations of gentamicin-resistant Pseudomonas aeruginosa from burns was detected in June 1979, despite the restricted use of gentamicin and improved isolation procedures. Patients with burns over 15% of their body acquired a resistant strain six to 11 days after admission. These patients were admitted to a single isolation cubicle-the "shock" room -and at first no source of the organism could be found. The room and its contents were cleaned with a phenolic disinfectant after each patient was discharged. Detailed bacteriological studies were made of the patients, the staff, and the environment to identify the source of infection and mode of transfer.

Haemolytic streptococci of groups A, C, D, G, and others were isolated by aerobic culture from burns in a consecutive series of 1,277 swabs more often on P.N.F. medium than on blood 4% agar.