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opposing sides, but there were some signs that such action might be necessary in similar circumstances.Conclusions-As well as continuing to care for its normal patients an accident and emergency department will have to make special arrangements to prevent the department becoming overloaded with riot casualties. These arrangements should include (a) the use of a large area within the department, preferably next to the minor injury area, for receiving and sorting the riot casualties; (b) the provision of special teams for suturing, extra reception and portering staff, and

Three patients with an acute colitis in which the only pathogen detected was either Aeromonas hydrophila or A sobria progressed to a chronic phase after the infection had been eliminated by antibiotic treatment in two and had resolved spontaneously in the third. The final diagnosis in each case was ulcerative colitis. Two of the patients have responded to antiinflammatory medication but one has required panproctocolectomy. The sequence of symptoms and observations in these cases, as well as in others from the literature involving more familiar pathogens, suggests that bacterial infection may contribute to the development of chronic colitis. This supposition could be tested by extending the follow up of patients with acute infective colitis in a prospective multicentre trial.