It will likely take Ireland's HSE health service weeks to restore its computer systems, Health Minister Stephen Donnelly said on Twitter.
The government organization was hit by a major cyber attack last week.
“While it may take weeks to get all the systems back, progress is being made. Starting with services for the most urgent patients,” he writes.
The health service was hit by a cyber attack on the night from Thursday to Friday.
The computer system had to be temporarily shut down to protect it from the ransomware attack.
Criminals can lock computers remotely with this software.
Only when a ransom has been paid do they make the files accessible again.
Because the computer systems were shut down, hospital appointments had to be canceled nationwide.
People who urgently need help can go there.
The corona vaccinations are also continuing as planned.
The hackers have demanded a ransom, but Ireland has indicated that it is not willing to pay it.