There is a slight difference between the November campaign and the current mass testing we're having now. The one key difference is back then, we didn't have the B.1.1.7 strain. Now, almost 100% of our positive samples are B.1.1.7, which is more transmissible. We are not actually achieving 58% suppression of prevalence between each round, as we did in November, when we were still dealing with the old variant.
It's still measurable. We have the same vaccine coverage as all the other members of the European Union, yet we have one of the lowest infection rates and were one of the first countries to actually get to almost the bottom very rapidly.
The key success behind that is, as I said, isolating households. When isolating the household, you're effectively cutting the chains of transmission. Especially with the B.1.1.7 strain, what we've found is that when a member of the family gets sick, the whole family eventually develops symptoms; whereas with the old Wuhan type, or the pre-existing variants, the secondary attack rate was around 20% or 30%. Now, literally the whole household gets sick.
By isolating just the positive case, you will not cut the transmission effectively. By isolating the household—