> It's seems impossible anyone could test positive and still be asymptomatic.
Why? Most symptoms are part of the body's response switching into overdrive and not a direct consequence of cells getting subverted into virion farms. If the immune system wins without resorting to state of emergency measures like a fever you won't notice, but in the meantime there is a phase of viral replication in the throat.
With SARS-Cov-2 there is even the pattern that detection drops already in the throat of patients that still have a pneumonia raging in their lung (probably because the throat, as a battlefield in this war, somehow favors the immune system more than the lung?), so it's not even a subset/superset relation between symptoms and positive throat PCR, it's a partial overlap.
Seems impossible but from observation obviously is not.
Comorbidity is the issue with SARS-CoV-2. It is interesting that some patients testing positive report losing the sense of taste and/or smell while others report digestive problems prior to the onset of acute respiratory problems or even sore throat.
Why? Most symptoms are part of the body's response switching into overdrive and not a direct consequence of cells getting subverted into virion farms. If the immune system wins without resorting to state of emergency measures like a fever you won't notice, but in the meantime there is a phase of viral replication in the throat.
With SARS-Cov-2 there is even the pattern that detection drops already in the throat of patients that still have a pneumonia raging in their lung (probably because the throat, as a battlefield in this war, somehow favors the immune system more than the lung?), so it's not even a subset/superset relation between symptoms and positive throat PCR, it's a partial overlap.