Despite repeated exposure to COVID, some people have never tested positive. So are there genetic reasons, or is it luck? Researchers are trying to determine if there is a protective genetic factor and whether it can be replicated to protect nearly everybody.


Erika Edwards writing for NBC news, makes the following points:
  • The COVID virus being caught in a lump of mucus and then expelled may explain some people’s immunity. 
  • An International scientific team is working on the Covid Human Genetic Effort project.
  • A gene called HLA-B*15:01. may explain some people having asymptomatic infections.
  • Nearly 60% of the US population has had COVID.


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