Health professionals working on a temporary basis in emergency departments are twice as likely to make medication errors that harm patients, says a study of nearly 24,000 drug mix-ups at 592 U.S. hospitals.

Most of the temp workers’ mistakes were administration mix-ups made by nursing staff, who accounted for 76% of the errors. Physicians were responsible for 21% of the mix-ups, and other health professionals accounted for the rest.

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