Coronavirus cases had soared in the last week of August to almost 10,000 which is the highest rise since May.
According to the latest Test and Trace figures, a total of 9,864 people tested positive for the virus in the week to 2 September.
This is an increase of 43% in coronavirus cases compared to the previous week, and is also the highest number since the Test and Trace was launched in May.
In the week to 2 September 96.6% of contacts were contacted to self-isolate by the local health protection teams.
Dr Daniel Lawson, a lecturer in statistical science at the University of Bristol, warned that the figures showed “the number of new cases will continue to rise rapidly.”
Dr Lawson said, the delay in the infection process meant it will be hard to know if government action will stop the spread.
He added, “We must get the infection number per infection [R number] below one to prevent a large second wave which will be impossible to prevent reaching vulnerable populations.”