The Privacy Commissioner is warning that criminals responsible for a crippling ransomware attack on Waikato DHB are likely to release further personal information about patients.
John Edwards is asking people to "do the right thing" if they are sent people's personal details as a result of the breach.
Last week's cyber attack crippled the DHB's IT systems and significantly disrupted health services.
Cancer patients are being transferred around the country for treatment and non-urgent elective surgery has been postponed.
DHB bosses have confirmed that the hackers seized patient and staff information. Some files which contained the personal details of patients were sent to various NZ media outlets, including the Herald.