David Carter UK,
the concept of 'Viral Load' was initially my opinion of one possible factor in infection as reasoned from a occams razor simplistic POV.

Age and Underlying conditions remains a known primary factor.

This 'load' factor is untested to my knowledge, so blame me for the speculation. I can not prove this load theory but I do not see that thinking should be discouraged.
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The US Attorney General Bill Barr says if people sue to be free of what he calls house arrest, the governmnt will side against strict States and side with plaintiffs.
Bill Barr is on the side of genocide