A: “Compared to the dominant variant, what we look at is how much the other variants are more widespread and how much more lethal they are. The variant Delta is extremely diffusive, in fact it is sweeping the Alfa as it has already done in Great Britain and Spain. As for the Nigerian, South African and Californian, are much less widespread, they remain on lower percentages. Among the variants, the most widespread is always the one that worries us the most. Those that lower the effectiveness of vaccines are Beta, Gamma and Delta”