Just a little more than a year into the pandemic, it's not clear how many Covid-19 patients go on to develop what's called long-term Covid, or long Covid. A recent study that included mostly people who had just mild cases found 30% were reporting symptoms as long as nine months after contracting the virus. Other studies have found a higher percentage.
And almost every day that doctors work with these Covid long haulers brings new revelations about the syndrome, which manifests itself in a vast array of symptoms in patients of all ages and of every health status pre-Covid.
"We now realize it goes way beyond the standard post viral syndrome," said Dr. William Li, a physician of internal medicine and founder of the Angiogenesis Foundation, a nonprofit that focuses on the role of blood vessels in diseases.
"These symptoms can last for nine months. And we're going on to a year now, we're still seeing new symptoms unfold," said Li, a vascular biologist who has been researching Covid for almost a year.
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