The spread of the worm dubbed WannaCry - "ransomware" that locked up more than 200,000 computers in more than 150 countries - began after hours on Friday Australian time, scrambling data and demanding payments of $300 to $600 to restore access.
The organisation told trusts: "Our Data Security Centre continues to work around the clock alongside the National Cyber Security Centre, to support NHS organisations that have reported any issues related to this cyber-attack".
In its latest update on the incident, Europol said it was the "largest ransomware attack observed in history".
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A large-scale global investigation has been launched as police attempt to identify the perpetrators of the attack.
"I expect our services to be operating as normal from Monday (15 May 2017) including our community clinics".
BLOOD tests will resume at hospitals across mid Essex following the NHS cyber attack last week.
Several hospitals and health facilities in the NHS network suffered internal chaos after being hit with a hacking technique known as ransomware, which also affected institutions in more than 100 countries.
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"The way these attacks work means that compromises of machines and networks that have already occurred may not yet have been detected, and that existing infections from the malware can spread within networks", Britain's National Cyber Security Center said Sunday.
The attack plunged dozens of hospitals and doctors surgeries in England and Wales into chaos, with operations cancelled, ambulances diverted and patients moved.
It continues: "56 Dean Street is running a very limited emergency service for patients needing Post Exposure Prophylaxis (PEP) and Emergency Contraception". "Our immediate priority as a government is to disrupt the attack, restore affected services as soon as possible, and establish who was behind it".
NHS England sought to reassure patients, advising that A&E and other emergency services should still be used if needed.
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At NHS Western Isles, the radiology system has been affected and while it has had no impact on the care delivered locally, a spokesperson said it has affected their ability to share images with mainland Boards.
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