Against the new disease, we have none of this. This coronavirus is unknown to our species. Once it breaks into one of our cells, the extent of its spread through the body seems to vary significantly. The experience can slowly progress from the familiar—cough, congestion, fever—to a life-threatening inflammatory response as the virus spreads down into the lungs, filling the airways with fluid. Survivors can have
permanent scarring in the lungs. The virus can also spread into other organs, causing
liver damage or
gastrointestinal disease. These effects can play out over longer periods than in the flu, sometimes waxing and waning. Some patients have begun to feel better, then fallen critically ill. The disease can be fatal despite receiving optimal medical care.