There have been a few recent studies of cruise ships and meat packing plants with universal masking. In those cases an extremely high proportion of cases were asymptomatic.
To be clear, higher than in other cruise ships and other meat packing plants.
That’s the possibility, that lower viral load led to milder outcomes.
There was also a swiss military study where one group only got infected after distancing implemented. Positive cases, but no symptoms. Earlier group’s cases had symptoms.
To be clear, higher than in other cruise ships and other meat packing plants.