I think the OP referred to the pneumonia-like consequences (weakened immune system, issues with lungs that can last for months), effects common with certain str

I think the OP referred to the pneumonia-like consequences (weakened immune system, issues with lungs that can last for months), effects common with certain strong viral infections (chronic fatigue) and other effects (circulatory problems, thrombosis). Note that the first two categories are not exclusive to this virus at all: treatable diseases like "regular" pneumonia can cause them. The actual incidence of these effects, which can range from small to very severe, is unknown (given that a lot of cases are still missed). I've never heard about the 9% before, though.