That paper says the most transmission came from presymptomatic cases. That means from people without symptoms.
From a public health standpoint there’s no real difference between pre- and asymptomatic cases because you can’t tell them apart. You have to treat everyone as potentially contagious.
“From a public health standpoint there’s no real difference between pre- and asymptomatic cases because you can’t tell them apart. You have to treat everyone as potentially contagious.”
It does make a difference, because it has an impact on the likelihood that a given person without symptoms (infected or not) will transmit the disease. For example, if “presymptomatic” cases turn out to represent a very tiny percentage of the population, then the costs/risks of masks might outweigh the benefits, even if masks protect perfectly. All the more so if they don’t. And I imagine, particularly after accounting for false positives on Covid tests, that “asymptomatic cases” represent a sizable percentage of all cases.