Almost 16,000 cases of coronavirus in the UK went unreported because of a glitch caused by an Excel spreadsheet, it has been reported.
Public Health England (PHE) said 15,841 daily COVID-19 cases between 25 September and 2 October had been left out of UK totals.
The error has caused delays in tracking the contacts of people who tested positive.
On Monday, the Press Association (PA) news agency reported that the problem was caused by a Microsoft Excel spreadsheet reaching its maximum file size.
This prevented new names being added in an automated process, it said.
PA said files have now been split into smaller batches to prevent the error from happening again.