Major medical centers nationwide trying to understand why some COVID-19 patients continue to have symptoms weeks and even months after having been diagnosed with the coronavirus.

Amy Watson, 47, is one of those patients. She's had a fever, she said, for more than 100 days.

"It's been maddening," said Watson, a preschool teacher in Portland, Oregon. Since mid-March, her temperature has crept up to 100 or 101 degrees almost daily by midafternoon.

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.

Full coverage of the coronavirus outbreak

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.

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