The Prime Minister’s spokesman said in a briefing today that the omission of the statistic, which is usually published every day, was ‘not something I have noticed’.
The last time the Department of Health published the number was last Friday, May 22, when 80,297 people were swab-tested for Covid-19.
For the past five days the department has simply put a note saying ‘Unavailable’ in the section of the table it posts every day on Twitter.
Below that table officials note: ‘Reporting on the number of people tested has been temporarily paused to ensure consistent reporting across all pillars.
‘This is due to a small percentage of cases where the same person has had more than one test or tested positive for than once for #COVID19 in Pillar 2.
‘Corrections will be made to any figures if they have subsequently been found to have an error.’
The Department of Health has, since Friday, stopped reporting the number of people being tested each day and the total number of people tested. It explains this is to avoid reporting errors caused by some people being tested more than once
At the last count on Friday, a total of 2,144,626 people had been tested for the coronavirus since the outbreak began.
And today’s update showed that 3,798,490 individual tests have been carried out, with 117,013 done yesterday.
Friday’s data of 3,231,921 tests carried out on 2,144,626 people suggests that, on average, one in every three people is tested twice.
There is a ratio of 1.5 tests per person, meaning every 10 people incur 15 tests, suggesting every third person gets a second test.
Being tested more than once is not unusual in medicine and increases the accuracy of tests that may otherwise fall short of a perfect standard.
Dr Paul Hunter, a former NHS doctor and now medicine lecturer at the University of East Anglia, told MailOnline it was ‘valid’ to retest people.
‘Because the test isn’t 100 per cent sensitive, it can fail for a number of reasons,’ he said.
‘Some of these reasons are in the labs themselves, where there are all sorts of controls that may go wrong. Sometimes the sample comes in damaged and you have to ask if the patient can send another.
‘The other issue is taking a swab. The person who does this might not do it right – for example, they might not manage to scrape against the back of the throat. ‘
One of the main reasons for multiple tests is likely to be because doctors don’t want to misdiagnose someone as having – or not having – the virus.
If someone is hospitalised with coronavirus symptoms and lives with someone else who has tested positive, for example, they would be retested if their first swab comes back negative.
Dr Hunter said: ‘It may be that someone has symptoms synonymous with coronavirus – they have a sore throat and fever which has come on suddenly.
‘If this patient’s test comes back negative, the clinician might think something went wrong or “I better test them again just in case”.
‘I personally wouldn’t criticise the Government for including repeat swabs in their daily count.
‘But it should only include swabs that have been examined in the laboratory – not swabs that are posted to people.’