The HSE says the cyber-attack will continue to affect the health service for 'many more weeks' - despite some computer systems being restored.
About 10,000 appointments are being cancelled this week in the Saolta Group, which runs seven hospitals in the west and northwest.
It called off a similar number last week, due to the cyber attack.
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Saolta chief executive Tony Canavan says this will have short and long-term consequences:
