It's borderline. If 7% have 'personal belief exemptions', then the 'herd' is at 93%. And we have at least one example (the child in the article) of further me

It's borderline. If 7% have 'personal belief exemptions', then the 'herd' is at 93%. And we have at least one example (the child in the article) of further members who aren't vaccinated outside of this 7%. So the actual number is likely to be a little lower than 93%. Personally, I don't believe a model as simple as a % is likely to be workable in a school. If one of those 7% happens to sit beside him in every single class, the odds are going to defy the 'threshold' very quickly.