The Northern California division of Kaiser Permanente is notifying about 5,100 patients that protected health information was on a server found in February 2014 to be infected with malicious software.

In a letter to patients, the organization says it believes the server was infected in October 2011. Kaiser removed the server--used to store research data--and confirmed other servers were not affected and appropriately secured. “We currently have no information that any unauthorized person accessed the information on the server,” according to the patient letter. “However, the malicious software broke down the server’s security barriers so we are investigating and responding with a very high level of caution and concern. We are very sorry that this happened.”

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