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Coronavirus: statistics

This blog explains how and when data are published regarding COVID-19 cases and deaths in Wales. The World Health Organization (WHO) defines COVID-19 as the infectious disease caused by the coronavirus. We’ve included summary charts which will be updated twice a week and may be revised as the data published by Public Health Wales (PHW) change. Data for the most recent two or three days have been omitted as they are likely to change substantially as more cases, tests and deaths are reported.

Estimated reading time: 4 Minutes

Updated: 12 August 2020

Darllenwch yr erthygl yma yn Gymraeg | View this post in Welsh

This blog post explains how and when data are published regarding COVID-19 cases and deaths in Wales.  The World Health Organization (WHO) defines COVID-19 as the infectious disease caused by the coronavirus. We’ve included summary charts which will be updated weekly and may be revised as the data published by Public Health Wales (PHW) change. Data for the most recent two or three days have been omitted as they are likely to change substantially as more cases, tests and deaths are reported.

COVID-19 statistics are published by PHW every day on its dashboard. PHW publishes data on the number of testing episodes, confirmed cases and deaths. It cautions that all the data published on its dashboard are provisional and will be subject to daily revision.

Testing episodes and confirmed cases

PHW explains that individuals may be tested more than once for COVID-19. In its testing data PHW uses 6 week periods where if an individual is tested more than once within a 6 week period they are only counted once. If any test results are positive then this result is published as a confirmed case. Testing data are published by local authority of residence and are also broken down by sex and age for Wales. The testing episodes include confirmed cases in hospitals and elsewhere. Read our blog post on coronavirus: testing to find out more.

Cumulative number of confirmed COVID-19 cases per 100,000 resident population

Source: Public Health Wales

The graphs below show the daily number of new confirmed cases of COVID-19 by Local Health Board. A seven-day rolling average smooths the data to show the broader trend. The shaded area beneath each curve approximately corresponds to the cumulative number of cases. These are shown to the right of each graph for the most recent available data.

Daily confirmed cases of COVID-19 by date and Local Health Board

Source: Public Health Wales

Number of confirmed cases of COVID-19 in Wales by age and sex

Source: Public Health Wales

New testing episodes in Wales

Source: Public Health Wales

Deaths by date and LHB

PHW publishes the number of deaths suspected to be caused by COVID-19 in people who have tested positive, these are shown by date of death.

Daily deaths in Wales

Source: Public Health Wales

PHW states:

These figures only include deaths occurring in individuals who were laboratory confirmed with COVID-19. The majority of deaths reported here occurred in hospital settings, however a proportion occurred in care home settings. The figures do not include individuals who may have died from COVID-19 but who were not confirmed by laboratory testing. The true number of COVID-19 deaths will be higher.

The majority of care home deaths will not be counted in the PHW data and PHW states that its statistics will differ from the Office for National Statistics (ONS) suspected and confirmed COVID-19 deaths in England and Wales.

PHW also publishes deaths by Local Health Board (LHB) of residence and figures for some LHBs are suppressed if the number of deaths is 5 or lower to prevent individual deaths from being identified.

Other sources of data

The Office for National Statistics (ONS) publishes suspected and confirmed COVID-19 deaths in England and Wales in a weekly publication – Deaths registered weekly in England and Wales, provisional. This publication uses data made available after the death registration process and is therefore lagged by over a week. The latest data are analysed in our blog post Coronavirus: registered deaths.

The Welsh Government publishes a range of data and analyses on the effect of coronavirus on society in Wales. This page includes data on businesses and the economy, attendance at local authority education settings, NHS activity and capacity, shielding, testing and housing.

Public Health England publishes its data in a dashboard and the Scottish Government publishes daily statistics on its website with National Records of Scotland publishing a weekly update. The Department of Health in Northern Ireland publishes daily statistics on its dashboard. The World Health Organization (WHO) also have a dashboard showing confirmed cases and deaths around the world.


Article by Joe Wilkes and Helen Jones, Senedd Research, National Assembly for Wales

We’ve published a range of material on the coronavirus pandemic, including a post setting out the help and guidance available for people in Wales and a timeline of Welsh and UK governments’ response.

You can see all our coronavirus-related publications by clicking here. All are updated regularly.

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