That was what Hancock was trying to get over. They knew there was a spread, but didnt know why. The Bio folk had worked it out on Friday, pretty much an immediate response.
Like, we are all experts in covid stuff these days, but the folk who really know, who routinely alter the flu jab every year, were baffled. Until they isolated 9 out of 3000 proteins that make up a CV bug as changed, hence the increased spread it now has. They are confident the remaining 2991 proteins are the same, hence no increase in stuff like death.
With Marr trying to trip him up over taking the rise at PMQs was pretty low grade, imo.