"As stated before the real question is those that are missed with a false negative do they carry enough VIRUS LOAD to be contagious?"
Not at the time of the test, but the problem is with recently infected patients that have low but increasing virus load.
They get tested and due to their low virus load, 20-40% of them get a false negative result, but their virus loading is growing larger and they don't have symptoms. In the next day or two they become contagious, but since they tested "negative", they go out to bars/restaurants, events or go to family gatherings and don't wear a mask. So they spread the virus.
