so, how do you even get infected by this virus? everywhere i look they say the ways it can propagate, but not how the infection/contagion actually works.

do you need a certain amount of virii per square meter in the air? do you need just one "unit" of virus? do you need do continuous reinfection for it to work on your body? when does it reach a critical mass stage where it just becomes a full blown neumonia?

no one is explaining any of this, not even the flu with all its popularity had ever been explained on how it actually infects the body, its sounds like listen and believe bullshit, viruses are the shadiest concept ever.