every 15—to—20 minutes. dr hans kluge, the who's regional director for europe, spoke to the bbc earlier. we are definitely worried. but the good news is that we know what to do. let's look to the positive side — portugal, spain, where i have been recently, they are implementing what i call a vaccination plus path. they are vaccinating, now they are boosting but also implementing the basic measures like masks. average 48% of the european population is wearing a mask indoors. any percentage above that will have an immediate effect. much more attention to be paid to ventilation. and, finally, two new treatment protocols which have to be standardised.