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MONDAY, JUNE 05, 2023
Preliminary study finds UK lockdown is slowing spread of Covid-19

Coronavirus chronicle

Reuters
01 April, 2020, 04:50 pm
Last modified: 01 April, 2020, 04:56 pm

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Preliminary study finds UK lockdown is slowing spread of Covid-19

Scientists used an online survey to ask 1,300 people in Britain to list their contacts for the previous day - and found that the average number of contacts now is more than 70 percent lower than before the lockdown

Reuters
01 April, 2020, 04:50 pm
Last modified: 01 April, 2020, 04:56 pm
A staff member wearing a protective face mask at an NHS drive through coronavirus disease (COVID-19) testing facility in the car park of Ikea in Wembley, as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 1, 2020. REUTERS/John Sibley
A staff member wearing a protective face mask at an NHS drive through coronavirus disease (COVID-19) testing facility in the car park of Ikea in Wembley, as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 1, 2020. REUTERS/John Sibley

Lockdown and social distancing measures introduced by the British government to slow the spread of COVID-19 may already be working, according to preliminary research findings, and could soon see Britain's epidemic of infections declining.

Scientists used an online survey to ask 1,300 people in Britain to list their contacts for the previous day - and found that the average number of contacts now is more than 70 percent lower than before the lockdown.

"If we see similar changes across the UK population, we would expect to see the epidemic to start to decline," said John Edmunds, who led the study at the London School of Hygiene & Tropical Medicine (LSHTM).

He added, however, that the findings were very preliminary and should not be seen as suggesting "job done".

"Rather, they should be used as motivation for us all to keep following UK government instructions," Edmunds said. "It's imperative we don't take our foot off the pedal. We must continue to stop transmission of the virus to reduce the burden on the National Health Service now and over the coming months."

Like many other countries affected by the pandemic of disease caused by the new coronavirus, Britain has imposed strict social distancing measures including shop and school closures. Authorities are also asking everyone to stay at home except for essential travel.

The research, which was not peer-reviewed but was posted on LSHTM'S Centre for the Mathematical Modelling of Infectious Diseases website, looked at a key feature of infectious disease epidemics known as the reproduction number, sometimes called the R0, or 'R nought'.

This describes the number of people, on average, who will catch a disease from a single infected person. If that number can be brought down to below one, this signals that an epidemic will decline.

Using the change in contact patterns, the Edmunds' team calculated a change in reproduction number between the pre-lockdown and post lockdown periods.

The finding that the mean number of contacts per person measured is more than 70 percent lower now than before the lockdown suggests that the R0 reproduction value now would be between 0.37 and 0.89, they said, with the most likely value being 0.62.

"The physical distancing measures..have substantially reduced contact levels and will likely lead to a substantial impact and a decline in cases in the coming weeks," the researchers wrote. "However, this projected decline ... will not occur immediately as there are significant delays between infection, the onset of symptomatic disease and hospitalisation."

United Kingdom (UK)

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