Another problem, and trust me,you know I'm a positive guy, but
Currently,testing isn't 100% for varying reasons, simply not done correctly, missing the highest concentrations of virus, as tests only work with a certain amout of virus showing
And
People will vary in their virus load,as this ramps up fast,things and amount of virus can change quickly.
All is not gloom and doom, finding people with those antibodies can,r should be free to work,without concerns of spread, but, we need to know how long and at what levels of those antibodies will stay at those levels.
Once infected, bad analogy here, but your cells get memory like memory muscle, and quickly start reproducing those antibodies.
At this point, those in highest danger just need to hang in there,avoid infection, and everything new coming out needs to be at these places of high potential harm.
We will only get better at this.