‘A slow burn’: Coronavirus symptoms often linger before worsening

As physicians across the country diagnose and care for a growing number of people with COVID-19, distinct patterns are emerging, giving clues about how the illness manifests itself in patients.

Very often, people start off with minor physical complaints — slight cough, headache, low-grade fever — that gradually worsen.

“Patients tend to have symptoms for about a week before …
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