Tuesday 04 August 2020
Select a region

Jersey's ‘R’ number drops below 1

Jersey's ‘R’ number drops below 1

Thursday 14 May 2020

Jersey's ‘R’ number drops below 1

The number of people catching covid-19 in Jersey has fallen from more than two new infections per patient, to fewer than one since restrictions began, figures released today have shown.

The finding came in a new report on Jersey’s ‘R’ number put together by Statistics Jersey, showing how measures such as physical distancing, school closures and the ‘stay at home’ order have dramatically affected the number of cases of the illness being passed through the community.

The ‘R’ or ‘reproduction’ number has been hailed as crucial in understanding the threat posed by the virus, and providing insight into how lockdown can be eased. 

It shows the number of people that one infected person will go on to spread covid-19 to.


CLICK TO ENLARGE: How Jersey's 'R' has dropped following the introduction of different measures.

A number higher than one is considered dangerous, as the number of cases will increase rapidly, potentially straining health services to the extent that they may not be able to cope.

Today’s report shows that Jersey’s number was as high as 1.9 to 2.6 in the early days of the crisis - meaning every one patient was infecting two or more new people.

However, this began to rapidly decline as protective public health measures were introduced, such as physical distancing, which was initially reserved for vulnerable groups, before being introduced for the whole population.

When lockdown began in Jersey, ‘R’ began to drop below one - a internationally-recognised signifier that the disease is petering out.

By 24 April, R stood at 0.4. However, this figure may have risen since Jersey stepped down to 'Level Three' this week.

The new figures can now be used to further inform Jersey’s approach to exiting lockdown, forming the basis of estimates as to how it will spread as different restrictions are lifted. 

“Although there is a degree of uncertainty in these estimates, the broad trend and levels are useful to indicate the impact of mitigation and to inform further decision-making,” the report read. 

Statistics Jersey put together the report following a method devised by Imperial College scientists, and using data from 1 March to 5 May. 

The data underscores the low level of new cases arising in the community. 

At present, the number of islanders officially confirmed to have the illness stands at 296, with just three new cases in the past week.

27 islanders have passed away from the illness, while 226 are deemed to have recovered. 

However, the results of a recent antibody testing pilot suggest that around 3,300 islanders may have been infected. 

CLICK HERE to read the full ‘R’ number report.

Sign up to newsletter



Comments on this story express the views of the commentator only, not Bailiwick Publishing. We are unable to guarantee the accuracy of any of those comments.

Once your comment has been submitted, it won’t appear immediately. There is no need to submit it more than once. Comments are published at the discretion of Bailiwick Publishing, and will include your username.

Posted by nigel pearce on
The article states that 27 people have died from the illness. The majority, if not all these deaths were due to other causes, not coronavirus, though the virus might have hastened their deaths in some cases.
Posted by Jon Jon on
It’s still surprising that there are still new cases of this virus,as an Island surely by now there should be none,unless people aren’t bothering to self isolate.
Posted by Scott Mills on
So glad we have the nightingale hospital. Put some breeze blocks around it, and we'll have our new hospital.
To place a comment please login

You have landed on the Bailiwick Express website, however it appears you are based in . Would you like to stay on the site, or visit the site?