Three times as many people have tested positive for Covid-19 in England in latest weekly figures compared to the end of August, Reuters reported quoting NHS Test and Trace.
More people are being referred to the system, though the proportion reached has fallen, NHS added.
The weekly Test and Trace stats showed that 21,268 people were transferred to the system, up 37 per cent on the week before.
However, 77.7pc of those people were reached and asked to provide contacts, down from 83.9pc the week before.