Another consideration on the ratio between infections of unvaccinated vs vaccinated is the extent to which the different groups react to the current prevalence of Covid.
If vaccinated people relax more when prevalence is low but are much more cautious when prevalence is high then that would tend to make the ratio increase as witnessed.
This would make sense to me—being unvaccinated will be correlated with generally being less concerned about covid
Another consideration on the ratio between infections of unvaccinated vs vaccinated is the extent to which the different groups react to the current prevalence of Covid.
If vaccinated people relax more when prevalence is low but are much more cautious when prevalence is high then that would tend to make the ratio increase as witnessed.
This would make sense to me—being unvaccinated will be correlated with generally being less concerned about covid