Hospitals installed more sinks to stop infections. The sinks can make the problem worse.

In a devilish case of unintended consequences, sinks have been linked to a number of outbreaks of serious infections in hospitals from Baltimore to Shanghai and many places in between in recent years. In one notable case, a hospital in the Netherlands took sinks out of the patient rooms in its intensive care unit in a bid to slow the spread of bacteria. (It worked.)