I think you can feel pretty confident it works. There are some great examples to monitor now. Israel which was seeing 10,000 new cases a day and should be seeing 15000 to 20,000 with the current wave had 200 cases yesterday with a 53% vaccination rate. The UK has been running 4000 to 5000 daily cases with a 30% vaccination rate compared with France having 40,000 to 50,000 daily cases and a 3% vaccination rate. The death rate in the US has dropped dramatically since we have achieved a high vaccination rate for the high risk groups.