I can't shake Covid-19: Warnings from young survivors still suffering
Updated 2124 GMT (0524 HKT) July 19, 2020
(CNN)Daniel is still hobbled by the severe viral infection that struck him in March and left him coughing up blood.
Three months ago, a 28-year-old environmental researcher from the United Kingdom, was on the road with friends in a band as they toured venues in the French Alps.
He came down with Covid-19 symptoms, and like many coronavirus patients, spent weeks in bed. He asked that his last name not be used in this story for professional reasons.
Unlike other people, however, Daniel's life hasn't returned to normal.
"Since then it's been on and off with extreme tiredness and fatigue," he said.
Every day he has brain fog, difficulty concentrating and problems with short-term memory that make reading, writing and speaking harder.
"Breathing has been very difficult," he said. "I don't feel like I have my full breath capacity. If I go for a walk for one minute, I'll be really exhausted."
The profound mark the disease has made on Daniel's life isn't uncommon.
"About 80% are going to experience a mild or asymptomatic version of Covid. It's the other 20% that we're worried about," said Dr. Luis Ostrosky-Zeichner, a professor of medicine at the University of Texas McGovern Medical School.