Some COVID-19 patients aren't getting better. Major medical centers are trying to figure out how to help.

She was diagnosed with COVID-19 in April, about a month after her symptoms — cough, congestion and extreme fatigue — began. Now, those symptoms have evolved into weeks of low-grade fever and a burning sensation under her skin. Watson's illness was never severe enough to warrant hospitalization. Instead, her symptoms have lurked in the background, never fully resolving. Doctors have had few answers for her.