NHS organisations across the country are braced for a possible recurrence of Friday's cyberattack when staff return to work today.
Cyber security experts have warned that the ransomware virus, which affected one in five NHS Trusts, could be reactivated by computers and devices that have not yet been switched on.
On Sunday evening seven acute hospital Trusts continued to experience major disruption and were diverting patients away from A&E for a third consecutive day.
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In total 47 organisations reported being affected by the cyberattack and the disruption will continue into the new working week.
NHS regional director for London, Anne Rainsberry, told Sky News: "If you have not heard from your hospital and you have an appointment, our message is you should attend as normal."
But she warned patients: "It may be a little bit slower when you get there because hospitals are using different systems, so please be patient."
Trusts in Lincolnshire and Southport and Ormskirk cancelled all routine appointments for Monday, and staff have been warned to exercise caution when logging in.
United Lincolnshire Trust and Northumbria Healthcare NHS Trust used social media to warn staff that they should not switch on any devices unless they have been specifically cleared by their manager.
Northumbria Healthcare said: "All staff should report for duty tomorrow as usual - however please DO NOT switch on or log in to any laptops, mobile devices or desktop PCs until advised to do so by your line manager."
Ciaran Martin, chief executive of the National Cyber Security Centre, warned there could be a fresh wave of victims on Monday.
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