The UK's health agency, Public Health England, says a "technical issue" means nearly 16,000 positive coronavirus cases weren't registered in the final week of September.
The files, containing the test data from labs, exceeded the maximum size which could be loaded onto its IT system, meaning the reporting of those results were delayed.
Benji Hyer has the story from London.
IN: This is more than
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http://www.fsnradionews.com/feeds/1005test-bh-generic.mp3