Can you tell us that if this winter, if Covid now spreads widely around Europe and elsewhere - as now looks likely - that a new variant that supercedes Delta will not emerge?
Delta has an R value of we think around the 5 to 9 range. Variants emerge from mass spread.
What happens if a variant emerges that has an R value of, say 15? What about 18? Measles has an R value of up to 18.
