CBD does not cure coronavirus. There is no study that reflects some claims that it does.
What CBD does is reduce the immune system's inflammatory response. Inflammation is a vital response that isolates infected areas and prevents toxins from spreading. CBD can promote apoptosis, or cellular death. CBD can prevent proliferation, or rapid cellular growth. CBD is like a vitamin supplement, it helps the body to function optimally by keeping inflammation in check. All disease arises from inflammation. By reducing inflammation, one may be able to fight off pathogens easier.
In addition to CBD, one should be taking vitamin C, D, and Zinc to boost immune system in hopes of not acquiring viruses. There are many other immune building herbs and treatments out there, so check web and see if any make sense to you. Also, a good nights sleep, fresh air, exercise, and some fun will help with this overwhelming sense of fear and doom. CBD will help with the anxiety and stress from the constant bombardment of media.
If you are on immunosuppressant pharmaceuticals, you should be very careful, staying home at the very least is your best defense and none/minimal contact with anyone, as these drugs actually suppress your immune system making you more susceptible to pathogens.
Take care and stay calm.
Update: Please see new post with regards to the role stress plays on your immune function.