The reproductive number or R-value of coronavirus transmission across the UK is between 0.8 and 1, the Government Office for Science and the Scientific Advisory Group on Emergencies (Sage) said.
Last week it was between 1.2 and 1.3.
R stands for the average number of people that each Covid-positive person will be infected.
If the number is above 1, it means that the breakout is increasing exponentially.
An R number between 0.8 and 1 means that on average every 10 infected people will infect between 8 and 10 other people.
The estimates for R and the growth rate are provided by the Scientific Pandemic Influenza Group on Modeling (Spi-M), a subgroup of Sage.
The growth rate, which estimates how quickly the number of infections changes from day to day, is between minus 4% and minus 1% for the entire UK.
This means that the number of new infections decreases by 1% to 4% every day.
Scientists who advised the government said that across all regions of England, estimates of the R number and growth rate are down from last week, and R is below or around 1 in each region.
However, they warned that despite the reduction, the number of cases “remains dangerously high and we must remain vigilant to keep this virus under control, protect the NHS and save lives”.
Wise scientists said, “It is important that everyone keep staying at home, whether or not they received the vaccine.
“We all have our roles to play and if everyone continues to play by the rules we can expect to see the R number cut across the country.”