One thing I have been wondering: Given that R has been near to 1 in many countries, wouldn't we need much lower immunity rates and/or vaccine efficiencies if we

One thing I have been wondering: Given that R has been near to 1 in many countries, wouldn't we need much lower immunity rates and/or vaccine efficiencies if we maintain the minimal impact measures such as public masks? My understanding would be that 10% immunity for instance would push R down by 10%. Once we get it below 1.0, we effectively won.