Let's hope they can hold their stuff together for the next 6-8 weeks then and get there. Since, nobody has high enough vaccination rate yet.
Sadly, there has always been a misunderstanding about vaccination rate as it related to herd immunity.
If you need 80% population immunity for herd immunity, for example, then you would need 80% of the population vaccinated with a 100% effective vaccine.
But the vaccines are not 100% effective. If vaccines were 90% effective, and you needed a population immunity level of 80%, then you would need 90% of the population vaccinated with the 90% effective vaccine.
But what happens if you need 80% immunity level, but the vaccine is only 75% effective? Then it's mathematically impossible to ever have a high enough vaccination rate.
Now, combine that with the waning effect of vaccines.... And we see what's happening here and elsewhere.
Israel and parts of the United States were indeed reaching something close to herd immunity in the Spring and early summer.
Let's imagine... pre-Delta... the required immunity level was 70%. We were primarily vaccinating with Pfizer and Moderna... 90%+ effective. As we started to vaccinate 70%+ of adults with 90% effective vaccines, plus some immunity already existing in many unvaccinated, we started to hit herd immunity. Israel is the extreme example -- they were down to a handful of cases per day.
Then 2 things happened --Delta, being more contagious --- 70% immunity was no longer enough. Now, you needed 80%, or whatever. And at the same time, the effect of the vaccines started to wane.
And thus, the Delta spikes. And as vaccines continue to wane, no level of unboosted vaccination will ever get us "vaccinated enough."
Which brings us back to the Israel example -- They boosted significantly. The majority of adults are now boosted in Israel. And sure enough, the disease spread is dropping tremendously. As those boosters get the vaccine efficacy back to 90%+.