According to INSA's weekly report on the evolution of the number of cases of Covid-19, the Rt - which estimates the number of secondary cases of infection resulting from each person carrying the virus - increased from 0.95 estimated on August 19 to 1.02 on Friday.

“The value of Rt was constantly below 1 between May 30 and August 19” in Portugal, says the INSA document, also indicating that four regions of the country have this indicator above this threshold.

The highest Rt is recorded in the Azores (1.26), followed by the North (1.08), Madeira (1.07) and the Centre (1.06), while the Algarve has 0.97, Lisbon and Vale do Tejo with 0.96 and the Alentejo with 0.93.