What people are not educated about is when are people who have Cov-19 contagious to others. It is generally not when they are asymptomatic (have no symptoms at all) and the majority who get a Cov-18 infection seem to be asymptomatic or have a mild illness response.
An infectious virus becomes potentially contagious to non-infected persons, via some form of person to person contact, when a person with the virus begins to exhibit viral shedding. In the Corona virus family viral shedding only occurs before the onset of symptoms about 14% of the time. 85% of the time, if illness has not shown up viral shedding is not happening and the infected person is not spreading the disease. It is not even clear how many (what %) who are Cov-19-positive are and remain asymptomatic until a subsequent test shows no longer positive.
That misunderstanding has led to overstatement of how infectious are the collective body of Cov-19 positive persons.
So, there —isn’t— asymptomatic spreaders of the Wuhan flu?