Problems with cyber security in NHS organisations were said to have been highlighted previous year by Dame Fiona Caldicott, the national data guardian, who warned issues were given insufficient priority and health bodies persisted in using obsolete computer systems.
"We have not seen a second wave of attacks and the level of criminal activity is at the lower end of the range that we had anticipated and so I think that is encouraging", he told Sky News.
Governments and computer experts girded Monday for a possible worsening of the global cyberattack that has hit more than 150 countries, as Microsoft warned against stockpiling vulnerabilities like the one at the heart of the crisis.
The warning was echoed by Britain's National Cyber Security Centre: "As a new working week begins it is likely, in the United Kingdom and elsewhere, that further cases of ransomware may come to light, possibly at a significant scale".
Hospitals in England and Scotland were forced to turn away patients and cancel operations on Friday after the NHS was hit by a large-scale "ransomware" attack. Seven of the 47 affected trusts were still having IT problems Monday. Channel One cited whistleblower Edward Snowden as claiming that it was "particularly concerning" that "the viruses that attacked the world were created at the National Security Agency".
Security experts said his move bought precious time for organisations seeking to block the attacks.
Qihoo had previously said the attack had infected close to 30,000 organizations by Saturday evening, more than 4,000 of which were educational institutions.
Europol estimates that 200-thousand cases have already been discovered in at least 150 countries.
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In China, the internet security company Qihoo360 issued a "red alert" saying that a large number of colleges and students in the country had been affected by the ransomware, which is also referred to as WannaCrypt.
In the wake of the attack, Microsoft said it had taken the "highly unusual step" of releasing a patch for computers running older operating systems including Windows XP, Windows 8 and Windows Server 2003.
Europol executive director Rob Wainwright said the situation could worsen on Monday when workers return to their offices after the weekend and log on. Certainly, other major state-run organisations have also been hit by the ransomware, including German railway company Deutsche Bahn and the US Department of Homeland Security. Patients are being urged to use the NHS "wisely", and only make appointments if urgent.
Microsoft was quick to change its policy, announcing free security patches to fix this vulnerability in the older Windows systems still used by millions of individuals and smaller businesses.
MalwareTech who wishes to remain anonymous, has said that they prevented more than 100,000 computers across the world from being targeted with a virus.
Ryan Kalember, senior vice president at Proofpoint Inc., said the version with no kill switch was able to spread but it contained a flaw that wouldn't allow it to take over a computer and demand ransom to unlock files.
Russian President Vladimir Putin, noting the technology's link to the U.S. spy service, said it should be "discussed immediately on a serious political level".