British government scientists said on Friday it was still likely that a resurgence in the Covid-19 epidemic was spreading exponentially despite survey data that suggested a small levelling off in a recent sharp rise of cases.
The Office for National Statistics had said there was some evidence that the steep increases in new Covid-19 cases, seen in recent weeks in England, was slowing down.
But government scientists urged caution as they published a reproduction "R" number that had risen slightly to 1.3-1.6 from 1.2-1.5, meaning that on average, every 10 people infected will infect between 13 and 16 other people.