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The UK has reported 12,594 new coronavirus cases and 19 deaths.
It occurs after several days of confusion as 16,000 cases in England they were omitted from the NHS Test and Trace scheme.
It led to a large increase from nearly 23,000 reported cases on Sunday.
Public Health England (PHE) said a technical problem had meant that 15,841 cases between September 25 and October 2 were left out of daily reports.
A problem has been blamed with an Excel worksheet reaching its maximum size.
The government said 6,500 employees had been recruited to help track the contacts of people whose positive tests were not reported.
Health Secretary Matt Hancock said in the Commons that 51% of the lost cases had been contacted a second time Monday morning.
He said the error “had not substantially changed” assessments of the disease and its impact.
The 19 new deaths reported on Monday were all in England and bring the UK total to 42,369.
They record people who died within 28 days of their first positive test, although coronavirus may not be the actual cause of death in all cases.
England had the vast majority of the most recent new cases, with 10,685.
Scotland had 697, Wales 596 and Northern Ireland 616.