If a hospital administrator notes a rise in the number of cases of Legionnaires’ disease among patients admitted overnight at the hospital, what should the administrator do next?

A rise in Legionnaires’ disease cases suggests a possible outbreak that needs investigation. The next step is to identify the source and causes so the hospital can take effective measures to control it. Evaluating incident reporting or changing admission policy would not directly investigate the outbreak, and announcing the rise before understanding it could cause unnecessary alarm. The correct choice is to identify the causes of the Legionnaires’ disease outbreak.

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