Washtenaw county is now breaking out vaccine+booster in hospital admissions stats. Of the last 475 hospital admissions, 182 were vaccinated, 8 were vaccinated and boosted.
Total cases are going through the roof though - over 100/100K yesterday. And Wash has the highest vax rate in SE MI. If there is such a thing as herd immunity for Omicron it's at a vaccination level we could never have reached under the best of circumstances. Of course if the world had reached herd level for Delta - Omicron might not have emerged. Than again, if Omicron is really closer to the common cold, maybe better that it did. Hard to know which side your bread is buttered on anymore!