This can explain why at current we respond to COVID-19 with measures affecting the entire population, and why an immunity passport will help 'release' from some restrictions those who are at reduced risk to transmit the virus:
This decision analytical model assesses the proportion of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) transmissions in the community that likely occur from persons without symptoms.jamanetwork.com
I only scanned quickly through the full article and didn't find what I was looking for. If this is an accurate analysis then for me the biggest implication is the inference it has on the mechanism of infection. If 59% of infections are due to people who have no symptoms or have not yet developed symptoms then they are by definition not obviously ill i.e. not coughing. If these people are able to spread the infection without coughing then it goes a long way to explain just how contagious this virus really is.