Covid-19 asymptomatic stats - It is hugely significant. South Korea test all mild cases plus direct contacts via tracing.
"About 20% of those who tested positive for the virus in South Korea end up showing no symptoms at all during their hospital stays, according to the country’s CDC head Jung Eun-kyeong. The patients are usually kept under observation for 14 days and are tested twice before being discharged. China uses a similar process to handle asymptomatic cases.
Iceland, which says it’s tested a higher proportion of inhabitants than any other country, found that about half those who tested positive have no symptoms of Covid-19, Thorolfur Gudnason, the nation’s chief epidemiologist, told BuzzFeed News."