The tweets are in Swedish, but I think the translate option should work pretty well for those who are interested.
To summarise, they just confirmed at Sahlgrenska in Stockholm that they have found a way of measuring antibodies in the blood of infected patients. I think they're first in the world with actually getting this to work, but I'm not sure. It's the first confirmation beyond theory that I've seen though.
Among other things it means that they can now see if someone has already had the disease, which is going to be dead useful if they can confirm that immunity is maintained over time. People working at hospitals who have antibodies in their blood could work with sick patients without risking getting infected, so no need for safety precautions and protective gear that is nigh on impossible to come by right now. Similarly, people with jobs that maintain social functionality could be let back to work. And so forth.
I think it has implications for how they're able to track illness in patients too, or rather how well their immune system responds to infection, which could potentially save up some hospital space. And last but not least it could provide an estimate of how much of the population that has been infected, how close we are to herd immunity, etc. All in all it sounds like a superb breakthrough.
