I am not sure we can deduce that from the paper. They are only testing clearly symptomatic patients. This cannot demonstrate asymptomatic infection if it exist

I am not sure we can deduce that from the paper. They are only testing clearly symptomatic patients. This cannot demonstrate asymptomatic infection if it exists. Tracing also cannot demonstrate asymptomatic infection. It may be able to demonstrate asymptomatic transmission, though. Today we define a Covid-19 case extremely liberally, which results in very low fatality rates. This is not comparable to the methods used for monkeypox in the early 2000s.