This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

More than a year into the pandemic, doctors say there are still some things they don’t fully understand about the virus, including the long-term impact on survivors.

Dr. Steven Phillips says many may never fully recover. He and former patient Dana Parish hope that their new book Chronic: The Hidden Cause of the Autoimmune Pandemic and How to Get Healthy Again will help shine more attention on what they call the hidden pandemic that has been growing for decades in America.