It’s a little too early to tell. Epidemics don’t explode immediately, you get single cases popping up and not all of them will transmit onwards. Plus there is a generation time involved. @magumtenebrosum has just sent me this link:
Researchers hope serological testing will help them better understand the epidemic
www.sciencemag.org
Which shows that serological tests are starting to be used. They arent widely used yet, but it shouldn’t take too long. . That means we can detect who has HAD the virus.
It all depends on how many people have been exposed to this. If it is millions we are in a better place than if it’s thousands. But in pandemic terms, we are still at the start, possibly at the bit where the curve starts to go upwards, but you don’t know that at the time, you can only see that after enough time has elapsed. Was that weird flu everyone got at xmas actually corona? Probably not, but if it was it does change a lot. We need to know.