An outbreak of Legionnaires’ disease that hospitalized 90 people and killed seven others has ended, according to the New York City Health Department .

This recent outbreak raises questions about Legionnaires’ disease. What causes the disease, and how serious is it? What symptoms do infected people exhibit, and who should be most concerned about the disease? How is it transmitted? How is the disease diagnosed and treated? And how can it be prevented?

To help with these questions, I spoke with CNN wellness expert Dr. Leana Wen. Wen is an emergency physician and clinical associate professor at George Washington University. She previously was Baltimore’s health commissioner.

CNN: What causes Legionnaires’ disease, and how serious is it?

Dr. Leana Wen: Legionnaires’ disease is a form

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