Most protective immunity is natural immunity

The numbers are so small as to be best rounded down to zero. So the good news is that the Delta variant is stacking up to be far less deadly than the prior variants. The bad news is that “immune escape” is really very much on the table. It hasn’t happened yet (that we know of) but the odds are stacking up in its favor as more and more vaccinated people are becoming infected with SARS2 despite being fully vaccinated. Dr Geert Vanden Bossche’s hypothesis is now an ‘open secret’ as it is now part of the risk factors listed by the UK heath authorities.