I'm really feeling confused and a bit worried. So, here's the thing: I got tested since I had a dry cough. Both the Covid antigen and PCR tests came back negative. But when I went to the hospital for the dry cough, they did something called an HRCT and noted a GGO and something about CORAD5. I'm not sure what this means. Could you explain what it's all about and if it's serious? I'm really not sure what to think here.