Moderator wrote:

We will closely monitor the posts for adherence to the above guidelines. We are all in this together, let us work together, and watch out for the health of each other. "

Quote:

Of the 12 patients (median age was 31 years with a range from 10 to 54 years, 50% were female), three had a trip to Wuhan recently. Due to the silent nature of the infection, the patients did not manifest any clinical symptoms and did not report any health complaints. Table 1 shows the basic demographic characteristics, history of chronic diseases before hospitalization, and blood test results. Compared with other patients, these cases are more likely to be young and healthy. Except for one patient with lymphocytopenia, the white blood cells and lymphocytes of the other patients were normal, and the nucleic acid continued to be positive in 12 patients. All patients had no chronic underlying diseases except for one with rheumatoid arthritis. Two of the patients had the virus for more than a month and pulmonary lesions in the asymptomatic infected patients were mild and resulted in no pneumonia.

Quote:

The median communicable period, defined as the interval from the first day of positive nucleic acid tests to the first day of continuous negative tests, was 9.5 days (up to 21 days among the 24 asymptomatic cases).

RambleOnNW wrote:

Here is a report on two hairstylists in Missouri that were found to be infected with Covid-19 and had had 140 clients. Result: No clients were infected. The hairstylists and all 140 clients were wearing masks.

https://www.livescience.com/hair-stylists-infected-covid19-face-masks.html

RambleOnNW wrote:

Are you familiar with statistical sampling? The sample size of 46 tests negative closely matches statistical sampling producing a conclusion of no one was infected out of a population of 140 with a 90% confidence, a margin of error of +/- 10%, and a sample size of 47.

You can check the numbers here.

Also I read about the 24 asymptomatic patients and the situation is not comparable. The 24 were selected as asymptomatic close contacts of other infected people. 5 out of the 24 eventually showed typical Covid-19 symptoms.