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Infection trend in Wales uncertain as weekly Covid survey comes to an end

24 Mar 2023 4 minute read
Covid testing swab. Picture by the Welsh Government

The final weekly Covid data survey has described the trend for infections in Wales as uncertain, while in England the number of people with the virus has risen to the highest level since the start of the year.

Over the week ending 13 March, the estimated number of people testing positive for Covid-19 in Wales was 74,500, an increase of 9% from the previous week when 68,200 people where estimated to have  the virus.

The latest figures equate to 2.41% of the population, or around 1 in 40 people.

An estimated 1.5 million people in private households in England were likely to have had coronavirus in the latest study, up from 1.3 million the previous week, according to the Office for National Statistics (ONS).

It is the highest total for England since the week to January 3, when the total stood at 2.2 million.

The trend in Scotland and Northern Ireland is also described as uncertain, with the ONS warning there is greater uncertainty in the latest figures for Scotland and Wales due to a low number of samples received by the ONS.

There ere also too few samples returned in Northern Ireland to produce a new estimate.

Some 136,200 people in Scotland were likely to have Covid-19 in the week to March 13, or around one in 40, compared with 105,100 or one in 50 the previous week.


This is the last time that regular estimates of coronavirus are being published, as the long-running infection survey – dubbed the “envy of the world” for its success in tracking the virus – has been halted.

Any further monitoring of Covid-19 will be announced after a review to ensure it is “cost effective”, according to the UK Health Security Agency.

Michelle Bowen, ONS head of health surveillance dissemination, said: “This week’s data show infections are rising in England; however, the trend is uncertain across the rest of the UK.

“In England, positivity increased in children and those aged 50 and over.

“The North West, East Midlands and South East of England all saw infections increase, though the trend is uncertain in all other regions.”

The infection survey has run continuously for nearly three years, providing valuable weekly data on levels of Covid-19 across the UK and allowing successive waves of the virus to be identified and tracked.

It has also supplied crucial information on the emergence of new variants, antibody levels and long Covid.

The survey collected tests from households regardless of whether participants knew they had Covid-19, or if they were reporting results to the NHS, meaning it provided a snapshot of the true spread of the virus, which was often underestimated by Government figures.


Sir David Spiegelhalter, emeritus professor of statistics at Cambridge University and chairman of the advisory board for the survey, told the PA news agency it had been an “extraordinary achievement” which has provided “vital evidence of great value both to national policy and international scientific understanding”.

He continued: “There is a general consensus that the survey has been a world-leading demonstration of how health surveillance can best be done. It is expensive, and this has led to it being paused, but the participant group is not being disbanded and a survey should be able to ramp up when necessary.

“Meanwhile there are important lessons to be learned for future emergencies, both by us and every other country. The survey has been the envy of the world and is a jewel in the crown of UK science.”

The survey was rolled out across the UK during summer 2020, just after the first wave of the virus.

It has measured every wave since then, with its figures revealing the biggest wave came in spring 2022 when weekly infections hit 4.9 million, followed by winter 2021/22, which peaked at 4.3 million.

In recent months the survey has helped track the scale and progress of the Christmas 2022 wave, which peaked at nearly three million infections, as well as the latest rise in prevalence.

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1 year ago

Health intel remains vital in a mobile society and a world 🌎 offering fast viral infection models. Small nations enjoy a good track record of using emerging tech and cross ❎ info links to GPs plus public health bodies to detect and track a range of viral challenges. Wales needs to set up a matrix of health intelligence points perhaps around universities and major health centres to encourage an integrated approach. Prevention through education and research based on factual shared data works .

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