Many of those victims will be businesses, including large corporations.
In a blog post late Sunday, Microsoft President Brad Smith appeared to tacitly acknowledge what researchers had already widely concluded: The ransomware attack leveraged a hacking tool, built by the U.S. National Security Agency, that leaked online in April.
He told the BBC the act was "unprecedented in its scale" and warned more people could find themselves affected on Monday morning.
In a statement it said: "East Kent Hospitals unaffected by yesterday's cyber attack".
Computer systems were shut down across the area on Friday after the NHS fell victim to a "ransomware" attack.
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The NHS was among hundreds of organisations affected around the world, with 47 trusts hit.
That's why the government, when we came into government in 2010, put money into cyber security.
Liz Capp-Gray, acting director of health informatics at Medway Foundation Trust, said: "I can confirm that we have not, so far, been directly targeted by the WannaCry ransomware attack".
An NHS IT worker told the Guardian that users experienced a "bitcoin virus pop-up", demanding payment before they could access their PCs.
"However, our hospitals are still experiencing IT disruption and we are very sorry for any delays and cancellations that patients have experienced".
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"The public can help us at this busy time by choosing alternatives to A&E, such as pharmacy services and NHS 111, if they have non-life threatening conditions".
The latest virus attack last week exploits a flaw in a version of Microsoft Windows first identified by U.S. intelligence.
Cybersecurity experts say the worm affects computers using Microsoft operating systems and takes advantage of a vulnerability in the software to spread the infection.
Problems with cyber security in NHS organisations were highlighted past year by Dame Fiona Caldicott, the national data guardian, who warned that issues were given insufficient priority and that health bodies persisted in using obsolete computer systems, The Times said.
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