Some NHS staff with Covid-19 in Wales' worst coronavirus-affected area were given the wrong test results and told they had tested negative for Covid-19.

A total of 10 samples from 96 were mistakenly attributed to the incorrect individuals.

Of the 10 cases, eight related to healthcare workers from the Aneurin Bevan University Health Board area, and two individuals from elsewhere in Wales.

Information such as how many had Covid-19 and were told they had tested negative, or vice versa, has not been disclosed.

The health board - covering Blaenau Gwent, Caerphilly, Newport, Torfaen and Monmouthshire - has seen the highest numbers of confirmed cases of Covid-19 in Wales.

Public Health Wales say the error was identified "within a few hours", while the health board said the affected staff members were contacted "immediately" and it had taken action to prevent further errors.

A spokesman said: "Since the 14th of March we have undertaken circa 1,600 staff tests.

"As part of our checking process, we identified a local transcribing issue with eight test results that led to us giving staff members wrong results.

"Staff were contacted immediately and the health board has undertaken a detailed review of all staff tests and taken action to remove any further risk of transcribing errors."

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Public Health Wales said no harm was caused to the individuals concerned.

A spokesman said: “During the process of bringing on a new Covid-19 testing platform in the laboratory, 10 samples from a batch of 96 were mistakenly attributed to the incorrect individuals.

“The quality checking processes ensured that the error was identified within a few hours, and the samples were retested to obtain the correct results which were communicated to the clinicians who had requested the tests.

“Of the 10 cases, eight related to healthcare workers from the Aneurin Bevan University Health Board area, and two individuals from elsewhere in Wales.

“Public Health Wales acted quickly to establish the facts and was able to confirm that no harm had been done to the individuals concerned. Following established protocols the incident was reported to the Chief Medical Officer.

“We are continually reviewing our systems and processes to ensure that such incidents do not happen again. We continue to have complete confidence in the testing process, and the laboratory staff carrying out the testing procedures.”

Gwent is the worst-affected area in Wales, with figures this week showing that Newport had the highest number of incidents per 100,000 people anywhere in the United Kingdom - with over 277 diagnosed cases per 100,000 population.

Wales' Covid-19 death toll has now hit 212, with Public Health Wales confirmed a further 19 fatalities on Tuesday (April 7).

There are now 3,790 confirmed cases in Wales, including 291 new cases of Covid-19 declared on Tuesday, Public Health Wales said.