Supermarkets are the most common places that people have visited in the days leading up to a positive coronavirus test reported to the Test and Trace app in England, new data suggests.
Public Health England (PHE) collated the data using the NHS Test and Trace app - meaning that the figures were based on members of the public who had the app and had tested positive for COVID-19.
PHE said the data did not prove where people were contracting coronavirus.
This week's government Test and Trace data showed that of those who tested positive, some 60.5% had their close contacts traced.
By analysing the contacts and retracing the steps of the 128,808 people who'd reported they had tested positive between 9 November and 15 November, PHE data has uncovered the most frequent locations people with the virus had been, prior to testing positive.
During the increased national restrictions in England, supermarkets have remained open for shoppers. The data suggests they are the primary setting where those who had tested positive with the disease reported to have been.
Helen Dickinson, chief executive of the British Retail Consortium, said: "Supermarkets are one of the very few places that people can visit during lockdown so it is unsurprising that they feature strongly when people are asked where they have visited.
"Retailers continue to follow all safety guidance to make their premises COVID-secure."
The second most common location reported by those who tested positive for COVID-19 were secondary schools, followed by primary schools, and then hospitals, and then care homes.
Of those who tested positive for COVID-19 in the days analysed by PHE, 18.3% of them said they had visited a supermarket.
Approximately 9,789 common locations were reported in total - of which the below list calculates the percentage of the most frequent.
Proportion of all common locations reported in PHE data:
Supermarket - 18.3%
Secondary school - 12.7%
Primary school - 10.1%
Hospital - 3.6%
Care home - 2.8%
College - 2.4%
Warehouse - 2.2%
Nursery preschool - 1.8%
Pub or bar - 1.6%
Hospitality - 1.5%
University - 1.4%
Manufacture engineering - 1.4%
Household fewer than five - 1.2%
General practice - 1.1%
Gym - 1.1%
Restaurant or cafe - 1.0%
In the most recent week, 124 clusters of COVID-19 were recorded in English secondary schools, with the PHE data charts showing the virus is most prevalent among the older age group.
The total number of outbreaks in secondary schools in England is 822, while primary schools have recorded 732 clusters since records began.
Shopping, attending childcare educational settings and eating out were among the top three activities reported by people testing positive before experiencing any symptoms, the data showed.
The PHE data suggests that the number of contacts by exposure was highest among households and household visitors.
PHE charts also suggest that infection rates appear to be levelling off or even declining in some parts of England, such as the North West and Yorkshire and the Humber.
Cases are lower but are still rising in places such as London, the South East and the West Midlands.
And while COVID-19 rates appear to be falling in England for most adult age groups, the PHE data suggests they are continuing to rise among people over 70.
The highest rate is still among 20 to 29-year-olds, which stood at 362.1 cases per 100,000 people in the week to 15 November, a fall from 389.9 in the previous week.
Infection rates appear to be dropping in 30 to 39-year-olds, 40 to 49 year-olds, 50 to 59-year-olds, and 60 to 69-year-olds, but slightly rising for 70 to 79-year-olds, from 146.1 to 147.5.
For those aged 80 and over, rates have climbed from 235.5 to 245.3, while also increasing for 10-19 year-olds, from 232.8 to 257.4.
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The new data comes as government scientific advisers are warning that mixing at Christmas poses "substantial risks" - particularly for older people - and there is "far too much emphasis" on having a normal festive period.
Professor Andrew Hayward of University College London (UCL) said the country was "on the cusp" of being able to vaccinate older populations and it would be "tragic" to throw away the gains made in suppressing the disease.
Meanwhile, a leading World Health Organisation (WHO) official suggested families could meet for picnics in the park during the festive season, adding that this year will be "a different Christmas but that does not mean it cannot be a merry one".