A Department of Veterans Affairs hospital in Pittsburgh and other facilities use an ionization system to avert Legionnaires' disease outbreaks, according to this article. But officials with the Centers for Disease Control and Prevention call chlorinated products "the best strategy" for fighting legionella, rather than ionization technology, which the Pittsburgh hospital adopted nearly 20 years ago. "Other hospitals with [ionization] systems should carefully review their continued usage of this system," CDC spokeswoman Alison Patti said.

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