This maybe explains some of HK, contrasting with the UK and US. All have total population vax rates 76-78%.…

This maybe explains some of HK, contrasting with the UK and US. All have total population vax rates 76-78%. But the UK and US infected a lot more people in the pandemic, they may have more infection-based immunity. Though relativities - US and HK death rate similar even today. https://t.co/WqX3V03ZTF