That 1 in 609 was about children under 12 months who contracted measles.
Yeah, and the larger number was in a largely vaccinated population.
The 1 in 609 number is in unvaccinated populations.
It’s kind of apples to oranges, where the oranges are very stupid and never get protection and the apples are protected.
It’s a bit hard to compare these ratios in progressive populations where some are really dumb.