i think, the articles misses one things: where does the infection start?
normally it starts in the throat and then drips down into the lungs. this takes a few days. within these days the body starts to build up immunity/resitance.
if the virus load is high the infection can start directly in the lungs. this is (i think) one of the causes why some young and healthy people get very sick very quickly.
germany has put huge restristions on social life.
my thoughs on viral load: i think, normal flue germs are nearly everywhere. but we don t get the flue everytime it comes around. so there MUST be some resitance, at least against small doses/virus loads.
do you remember the "bodies police force" from: Once Upon a Time... Life